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【单选题】
尺长误差和温度误差属A.
偶然误差
B.
系统误差
C.
中误差
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【单选题】By the time they reached the bus stop, the bus__________ for ten minutes.
A.
had left
B.
have left
C.
had been away
D.
have been away
【单选题】My mother _________ a teacher for ten years. [ ]
A.
has has
B.
has been
C.
have had
D.
has had
【单选题】If my horse had won today, it_____ ten races in three years.
A.
won
B.
did have won
C.
Must have won
D.
would have won
【单选题】The passengers on the plane have been held ______ for ten hours before the police had a firm control over the hijackers.
A.
captive
B.
capsule
C.
cavity
D.
casualty
【单选题】By the time I got to the theatre, the play __________ for ten minutes.
A.
had been on
B.
had begun
C.
have been on
D.
has begun
【单选题】Had you joined the caht room ten minutes ago, you would have known what we _______about then.
A.
had talked
B.
have talked
C.
talk
D.
were talking
【单选题】Had you joined the chat room ten minutes ago，you would have known what we about then．
A.
had talked
B.
have talked
C.
talk
D.
were talking
【简答题】在近代侵略中国，是想要把中国()。 A变成资产阶级共和国 B保持原有的封建社会 C变成它们的殖民地和半殖民地 D变成社会主义国家
【简答题】有机物A是一种广谱高效食品防腐剂，如图所示是A分子的球棍模型。回答问题： （1）写出A的分子式：________； （2）A能够发生反应的类型有(填序号)：________； ①氧化反应 ②加成反应 ③取代反应 ④消去反应 （3）写出A与足量烧碱溶液反应的化学方程式：________； （4）下列是一些中草药中所含的有机物： 其中互为同分异构体的是(填序号)：______；能与溴...
【判断题】If it had rained another ten minutes, the game would have been called off.()
A.
正确
B.
错误
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