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【单选题】
The cellphone, a device we have lived with for more than a decade, offers a good example of a popular technology's unforeseen side effects. More than one billion are (1)_____ use around the world, and when asked, their (2)_____ say they love their phones for the safety and convenience (3)_____ provide. People also report that they are (4)_____ in their use of their phones. One opinion survey (5)_____ that '98 percent of Americans say they move away from (6)_____ when talking on a wireless phone in public' (7)_____ '86 percent say they 'never' or 'rarely' speak (8)_____ wireless phones' when conducting (9)_____ with clerks or bank tellers. Clearly, there exists a (10)_____ between our reported cellphone behavior. and our actual behavior. Cellphone users that is to say, most of us are (11)_____ instigators and victims of this form. of conversational panhandling, and it (12)_____ a cumulatively negative effect on social space. As the sociologist Erving Guttmann observed in another (13)_____, there is something deeply disturbing about people who are' (14)_____ contact' in social situations because they are blatantly refusing to (15)_____ to the norms of their immediate environment. Placing a cellphone call in public instantly transforms the strangers around you (16)_____ unwilling listeners who must cede to your use of the public (17)_____. a decidedly undemocratic effect for so democratic a technology. Listeners don't always passively (18)_____ this situation: in recent years, people have been pepper-sprayed in movie theaters, (19)_____ from concert halls and deliberately rammed with cars as a result of (20)_____ behavior. on their cellphones.
A.
of
B.
for
C.
in
D.
by
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【简答题】5克锌与100克稀硫酸混合,得到无色溶液。 (1)若二者恰好完全反应,则在100克稀硫酸中溶质的化学式为 ,其质量为 g,溶剂的的化学式为 ,其质量为 g,完全反应后,所得溶液的质量为 g,其中溶质的化学式为 ,其质量为 g,溶剂的的化学式为 ,其质量为 g。 (2)若二者不是恰好完全反应,则剩余的反应物是
【单选题】含 50 克硫酸的 500mL 硫酸溶液的物质的量浓度是:
A.
0.49
B.
0.1
C.
0.98
D.
1.02
【简答题】12克Mg条与100克稀H2SO4恰好完全反应,则该硫酸中溶质的质量是 克,原硫酸溶液中溶质的质量分数是 。生成物溶液中溶质的化学式是 。生成物溶液的溶质质量分数是 。 请写出具体的计算过程。
【单选题】世界上城市人口所占比例最大的洲是 [     ]
A.
北美洲
B.
大洋洲
C.
欧洲
D.
亚洲
【单选题】将一定质量的镁、铝、铁三种金属的混合物与足量的稀硫酸充分反应后,生成氢气2克,则原混合物质量不可能是(  )
A.
18克
B.
24克
C.
28克
D.
50克
【简答题】由铜片、锌片和100mL稀硫酸溶液组成的原电池中,当铜片上产生2.24L(标准状况)气体时,此时溶液中硫酸的物质的量浓度为1mol/L,试计算: (1)锌片质量减轻了多少克? (2)原稀硫酸溶液的物质的量浓度是多少?
【简答题】49克硫酸的物质的量是 mol
【单选题】是某学校实验室从化学试剂商店买回的硫酸试剂标签上的内容。据此,下列说法正确的是
A.
该硫酸的物质的量浓度为9.2mol/L
B.
1molZn与足量的该硫酸反应产生2克H 2
C.
配制200ml 4.6mol/L的稀硫酸需要取该硫酸50ml
D.
该硫酸与等质量的水混合所得溶液的物质的量浓度大于9.2mol/L
【单选题】胆石症、胆道蛔虫症、肾绞痛患者,腹痛症状发作时,多采取何种体位
A.
强迫蹲位
B.
强迫仰卧位
C.
强迫坐位
D.
辗转体位
E.
强迫端坐位
【单选题】胆石症、胆道蛔虫症、肾绞痛患者,腹痛症状发作时,多采取何种体位
A.
强迫蹲位
B.
强迫仰卧位
C.
强迫坐位
D.
辗转体位
E.
端坐体位
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