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【单选题】
下列烯烃的物理性质的叙述中说法不正确的是( )。A.
含2~4个碳原子的烯烃为气体
B.
含5~15个碳原碳原子的烯烃为液体
C.
含18个以上碳原子的烯烃为蜡状固体
D.
含4~8个碳原子的烯烃为液体
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【单选题】---You didn't go to the party yesterday, did you? ---____________. I had to finish my paper.
A.
Yes, I didn't
B.
Yes, I did
C.
No, I didn't
D.
No, I did
【单选题】6位7段数码管动态显示模块如图所示，要求人眼看到所有数码管同时显示各自对应的数字，控制数码管位选信号的动态扫描时钟信号频率约为多少【图片】
A.
1kHz
B.
1Hz
C.
10Hz
D.
100Hz
E.
100kHz
F.
1MHz
【简答题】When 1 was 18 , one morning , my father told me to drive him into a town , about 18 miles away . I had just learned to drive , so 1 with pleasure . First we came to the town . Then I took the car to a...
【简答题】Ever since the industrial revolution began, factories, power plants, and ually, cars, have burned such as oil and coal, huge amounts of carbon dioxide and other gases into the atmosphere. These g...
【简答题】I entered St. Thomas’s Hospital as a medical student at the age of 18 and spent five years there. I was an unsatisfactory student, for my heart was not in it. I had always wanted to be a writer, and i...
【单选题】6位7段数码管动态显示模块如图1，要求人眼看到所有数码管同时显示各自对应的数字，控制数码管位选信号的动态扫描时钟信号频率约为多少（）【图片】
A.
1Hz
B.
10Hz
C.
100Hz
D.
1kHz
E.
100kHz
F.
1MHz
【判断题】Traditionally, large shippers build factories and warehouses near rail lines and have a section of track on their property called a freight station where goods are loaded on to or unloaded from rail c...
A.
正确
B.
错误
【简答题】生地黄与玄参的功效应用有何异同？
【简答题】The only real (1) China's pollution problems, scientists claim, is to cut emissions ( 排放 ) from power plants, factories and cars. ( solution) 2.The Chinese government has officially (2) the global gam...
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