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【单选题】
长白山天池属于( )
A.
构造湖
B.
火山湖
C.
冰川湖
D.
断陷湖
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【单选题】以下作用力对于范德华力贡献最大的是
A.
色散力
B.
诱导力
C.
取向力
D.
氢键
【简答题】Shelly__________California for Texas in 1996 and__________there ever since. A.left;worked B.has left;had worked  C.left;has worked D.has left;worked
【简答题】A.He has had a very quiet night. B.He has had a very restless night. C.He has had a very miserable night. D.He has had a romantic night.
【简答题】A.Jack has made others wait before. B.Jack has often had to wait for Shelly. C.Jack enjoys playing tricks with others. D.Jack doesn't usually make people wait.
【单选题】If metal is heated and then cooled very quickly, , by dipping in cold water, it will be very hard but will break easily.
A.
what’s more
B.
in general
C.
for example
D.
on the other hand
【单选题】Shelly ______ California for Texas in 1996 and ______ there ever since. [     ]
A.
 left; worked
B.
 left; has worked
C.
 has left; had worked
D.
 has left; worked
【单选题】Shelly has been preparing carefully for the driving test so that she can be sure of passing it at her first________.
A.
intention
B.
purpose
C.
attempt
D.
desire
【判断题】Shelly has a headache today.
A.
正确
B.
错误
【多选题】塑件结构设计的一般原则()
A.
塑件结构简单易于成型
B.
壁厚均匀
C.
保证强度和刚度
D.
装配间隙合计
【单选题】Shelly’s not neat at all. She is very _______ .
A.
messy
B.
critical
C.
stubborn
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