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错误
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【单选题】下面哪几项对信号系统的描述是对的?1. 信号系统的功能是保证与下一列车之间的安全距离,避免发生碰车事故发生。2. 安全距离是两列车之间的距离,无论后面列车以何种速度靠近前一列车,均能停车,并能避免撞车事故发生。3. 安全距离的影响因素包括:列车重量、列车速度、轨道坡度、制动能力及轨道状态。4. 信号系统的故障—安全原则是指,信号系统正常工作时能保证行车安全,系统发生故障时也不应危及行车安全。
A.
1,2,4
B.
1,3,4
C.
2,3,4
D.
1,2,3,4
【判断题】D-甘油醛与L-甘油醛是一对旋光异构体,也称为对映体。
A.
正确
B.
错误
【判断题】D- 甘油醛与 L- 甘油醛是一对旋光异构体,也称为对映体。
A.
正确
B.
错误
【单选题】下列表格中的各种情况,可以用如图所示曲线表示的是 选项 反应 纵坐标 甲 乙
A.
相同质量的氨气,在同一容器中发生反应:2NH 3 N 2 +3H 2 氨气的转化率 500 ℃ 400 ℃
B.
等质量的钾、钠分别与足量的水反应 H 2 的质量 钠 钾
C.
在体积可变的恒压容器中,体积之比为1∶3的N 2 、H 2 :N 2 +3H 2 2NH 3 氨气的浓度 活性高的催化剂 活性一般的催化剂
D.
2 mol SO 2 和1 mol O 2 在相同温度下发生反应:2SO 2 +O 2 2SO 3 SO 3 的物质的量 2个大气压 10个大气压
【单选题】Reading Comprehension Early in the age of affluence that followed World War Ⅱ, an Ameri
A.
11:Reading Comprehension Early in the age of affluence that followed World War Ⅱ, an American retailing analyst named Victor Lebow proclaimed, 'Our enormously productive economy... demands that we make consumption our way of life, that we convert the buying and use of goods into rituals, that we seek our spiritual satisfaction, our ego satisfaction, in consumption... We need things consumed, burned up, worn out, replaced and discarded at an ever increasing rate.' Americans have responded to Lebow's call, and much of the world has followed. Consumption has become a central pillar of life in industrial lands and is even embedded in social values. Opinion surveys in the world's two largest economies—Japan and the United States—show consumerist definitions of success becoming ever more prevalent. Overconsumption by the world's fortunate is an environmental problem unmatched in severity by anything but perhaps population growth. Their surging exploitation of resources threatens to exhaust or unalterably spoil forests, soils, water, air and climate. Ironically, high consumption may be a mixed blessing in human terms, too. The time honored values of integrity of character, good work friendship, family and community have often been sacrificed in the rush to riches. Thus many in the industrial lands have a sense that their world of plenty is somehow hollow—that, misled by a consumerist culture, they have been fruitlessly attempting to satisfy what are essentially social, psychological and spiritual needs with material things. Of course, the opposite of overconsumption—poverty—is no solution to either environmental or human problems. It is infinitely worse for people and bad for the natural world too. Dispossessed peasants slash-and-burn their way into the rain forests of Latin America, and hungry nomads turn their herds out onto fragile Mrican grassland, reducing it to desert. If environmental destruction results when people have either too little or too much, we are left to wonder how much is enough. What level of consumption can the earth support? When does having more cease to add noticeably to human satisfaction? Why does the author say high consumption is a mixed blessing? A.Because poverty still exists in an affluent society.
B.
Because moral values are sacrificed in pursuit of material satisfaction.
C.
Because overconsumption won't last long due to unrestricted population growth.
D.
Because traditional rituals are often neglected in the process of modernization.
【单选题】下列表格中的各种情况,可以用下面对应选项中的图象曲线表示的是 选项 反应 纵坐标 甲 乙
A.
外形、大小相近的金属和水反应 反应速率 Mg] Na
C.
4 mL 0.01 mol/L的KMnO 4 溶液,分别和不同浓度的H 2 C 2 O 4 (草酸)溶液各2mL反应 0.1 mol/L的H 2 C 2 O 4 溶液 0.2 mol/L的H 2 C 2 O 4 溶液 C 5 mL 0.1 mol/L Na 2 S 2 O 3 溶液和5 mL 0.1 mol/L H 2 SO 4 溶液反应 热水 冷水
D.
5 mL 4%的过氧化氢溶液分解放出O 2 无MnO 2 粉末 加MnO 2 粉末
【单选题】药用部位是根茎及根的药材是
A.
黄芪
B.
虎杖
C.
板蓝根
D.
牛膝
E.
党参
【单选题】When World War I ended on November 11, 1918, peace talks went on for months due to the Allied leaders wanting to punish the enemy and dividing the spoils of war. A formal agreement to end the war was ...
A.
peace talks
B.
agreement
C.
territory
D.
reparations
【单选题】相关系数r是表示两者之间存在一定的线性关系,以下选项中哪一个相关系数表示两者是一条平滑的直线。
A.
r>0.99
B.
0.95
C.
0.90
D.
r=0
【单选题】下列表格中的各种情况,可以用下面对应选项中的图象曲线表示的是(  ) 选项 反应 纵坐标 甲 乙 A 外形、大小相近的金属和水反应 反应速率 Mg Na B 4mL 0.01mol/L的KMnO 4 溶液,分别和不同浓度的H 2 C 2 O 4 (草酸)溶液各2mL反应 0.1mol/L的H 2 C 2 O 4 溶液 0.2mol/L的H 2 C 2 O 4 溶液 C 5mL 0.1mol/L N...
A.
B.
C.
相关题目:
【单选题】Reading Comprehension Early in the age of affluence that followed World War Ⅱ, an Ameri
A.
11:Reading Comprehension Early in the age of affluence that followed World War Ⅱ, an American retailing analyst named Victor Lebow proclaimed, 'Our enormously productive economy... demands that we make consumption our way of life, that we convert the buying and use of goods into rituals, that we seek our spiritual satisfaction, our ego satisfaction, in consumption... We need things consumed, burned up, worn out, replaced and discarded at an ever increasing rate.' Americans have responded to Lebow's call, and much of the world has followed. Consumption has become a central pillar of life in industrial lands and is even embedded in social values. Opinion surveys in the world's two largest economies—Japan and the United States—show consumerist definitions of success becoming ever more prevalent. Overconsumption by the world's fortunate is an environmental problem unmatched in severity by anything but perhaps population growth. Their surging exploitation of resources threatens to exhaust or unalterably spoil forests, soils, water, air and climate. Ironically, high consumption may be a mixed blessing in human terms, too. The time honored values of integrity of character, good work friendship, family and community have often been sacrificed in the rush to riches. Thus many in the industrial lands have a sense that their world of plenty is somehow hollow—that, misled by a consumerist culture, they have been fruitlessly attempting to satisfy what are essentially social, psychological and spiritual needs with material things. Of course, the opposite of overconsumption—poverty—is no solution to either environmental or human problems. It is infinitely worse for people and bad for the natural world too. Dispossessed peasants slash-and-burn their way into the rain forests of Latin America, and hungry nomads turn their herds out onto fragile Mrican grassland, reducing it to desert. If environmental destruction results when people have either too little or too much, we are left to wonder how much is enough. What level of consumption can the earth support? When does having more cease to add noticeably to human satisfaction? Why does the author say high consumption is a mixed blessing? A.Because poverty still exists in an affluent society.
B.
Because moral values are sacrificed in pursuit of material satisfaction.
C.
Because overconsumption won't last long due to unrestricted population growth.
D.
Because traditional rituals are often neglected in the process of modernization.
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