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【判断题】
根据平衡条件计算时,外力偶矩正负号是由左手螺旋定则判断的。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】就整个地球大气来说，受热能量的根本来源是太阳辐射，太阳辐射能被大气接收和转化的过程十分复杂，其加热大气的过程大致可以用图表示。读图完成题。 下列描述正确的是（）
A.
①——以长波辐射为主
B.
②——大约为①辐射量的19%
C.
③——是加热大气的主要直接热源
D.
④——多云的夜晚辐射能力减弱
【单选题】The police including an officer searching for the murderer in the area the other day.
A.
was
B.
are
C.
were
D.
is
【简答题】1907 年,蒙台梭利应邀办起了 _______ 。
【单选题】The United States today is the______largest country in size in the world.
A.
second
B.
third
C.
fifth
D.
fourth
【单选题】'Wanted by the FBI.' To the murderer, or the bank robber, these are the most frightening words in the world. When the criminal (罪犯) hears them, he knows that six thousand trained persons are after him...
A.
not at all useful
B.
very helpful for a while
C.
necessary for staying free
D.
important and useful
【单选题】Never before______so rapidly developing as it is today.
A.
has our country been
B.
has been our country
C.
our country has been
D.
our country been has
【简答题】'Wanted by the FBI.' To the murderer, or the bank robber, these are the most frightening words in the world. When the criminal hears them, he knows that six thousand trained persons are after him. Why...
【单选题】The house______ ready today but there has been a builders' strike it is still only half finished.
A.
was to be
B.
was to have been
C.
were to be
D.
should be
【简答题】剪贴板只能存放_______一次的剪贴内容。也就是说,前一次的内容就自动被_______。
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