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【单选题】
影响化学反应速度的因素主要有:反应温度、反应物浓度、是否使用催化剂等。取一定质量的用砂纸打磨好的镁带与足量的浓盐酸混合,反应速度与时间的关系如图所示。如下是对曲线变化趋势的三种解释:①ab段是因为该反应要吸收热量,使反应环境的温度降低; ②bc段是因为反应一段时间后要消耗一定质量的盐酸,再加上浓盐酸有挥发性,导致盐酸的浓度明显降低;③cd段是因为反应物镁带已消耗完,反应停止。针对如上三种解释,你认为错误的是 [ ]
A.
只有①
B.
只有②
C.
只有③
D.
全部都错误
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【单选题】Don't ____________ at me. [ ]
A.
looking
B.
to look
C.
look
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【单选题】将E-R模型转换为关系模型时,对于1对多的联系,需要( )。
A.
将一方的主码添加到多方中
B.
将多方的主码添加到一方中
C.
联系本身转换为一个关系模式
D.
以上都不对
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【判断题】一对多关系中,一方模型中添加多方模型的集合。
A.
正确
B.
错误
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【判断题】一对多关系中,多方模型中添加一方模型的对象。
A.
正确
B.
错误
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【单选题】The young lady responded to my greeting with a ______ look as if I were air, which made me feel somewhat embarrassed.
A.
vacant
B.
grateful
C.
desperate
D.
curious
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【单选题】Don’t worry about me, mum! I can _________ myself.
A.
look for
B.
look out
C.
look after
D.
look like
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【单选题】The girl ______ the bicycle is Jane.
A.
riding on
B.
driving in
C.
riding in
D.
driving on
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【单选题】According to the passage, aggressive driving is characterized by______.
A.
driving at full speed
B.
yelling at another driver
C.
talking while driving
D.
sounding the horn when passing
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【单选题】Her description of the garden made me ______ it.
A.
look for
B.
long for
C.
search for
D.
call for
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【单选题】Don't ______ the window. Listen to me carefully.
A.
look out
B.
look out of
C.
look out at
D.
look at
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相关题目:
【单选题】Don't ____________ at me. [ ]
A.
looking
B.
to look
C.
look
查看完整题目与答案
【单选题】将E-R模型转换为关系模型时,对于1对多的联系,需要( )。
A.
将一方的主码添加到多方中
B.
将多方的主码添加到一方中
C.
联系本身转换为一个关系模式
D.
以上都不对
查看完整题目与答案
【判断题】一对多关系中,一方模型中添加多方模型的集合。
A.
正确
B.
错误
查看完整题目与答案
【判断题】一对多关系中,多方模型中添加一方模型的对象。
A.
正确
B.
错误
查看完整题目与答案
【单选题】The young lady responded to my greeting with a ______ look as if I were air, which made me feel somewhat embarrassed.
A.
vacant
B.
grateful
C.
desperate
D.
curious
查看完整题目与答案
【单选题】Don’t worry about me, mum! I can _________ myself.
A.
look for
B.
look out
C.
look after
D.
look like
查看完整题目与答案
【单选题】The girl ______ the bicycle is Jane.
A.
riding on
B.
driving in
C.
riding in
D.
driving on
查看完整题目与答案
【单选题】According to the passage, aggressive driving is characterized by______.
A.
driving at full speed
B.
yelling at another driver
C.
talking while driving
D.
sounding the horn when passing
查看完整题目与答案
【单选题】Her description of the garden made me ______ it.
A.
look for
B.
long for
C.
search for
D.
call for
查看完整题目与答案
【单选题】Don't ______ the window. Listen to me carefully.
A.
look out
B.
look out of
C.
look out at
D.
look at
查看完整题目与答案