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【单选题】
The fact that both Weiss and Harlowe join the men in smashing the shelter door implies that ______.A.
even those who were against the use of drastic means can turn horrible beasts when an impending danger becomes too much for them
B.
at last they both come to see that they are duty-bound to take sides with the other neighbors against the Stocktons in the crisis
C.
at the last minute they both come to realize that they are under the oblgation to help their neighbors force open to the shelter door
D.
they are forced by their greedy and aggressive neighbors to join them in the terrible act
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【单选题】39 对零件进行尺寸标注时,在长、宽、高三个方向________尺寸基准,同一方向________辅助基准。
A.
不一定有/也不一定有
B.
均应有一个主要/还可以有
C.
均应有一个主要/可以有一个
D.
必须有一个/可以有一个
【单选题】为使下图电路中的锗晶体管工作在临界饱和状态( U CE =-0.3V ), R C 应取值为 KΩ(保留1位小数)?
A.
3.4
B.
4.4
C.
5.4
D.
6.4
【简答题】为使下图电路中的锗晶体管工作在临界饱和状态( U CE =-0.3V ), R C 应取值为 KΩ(保留1位小数)? 说明:单位已有,只填数字,否则算错误答案。
【简答题】MEDLINE光盘数据库可使用的布尔逻辑运算符、位置运算符、截词符、通配符、字段限制符和范围运算符分别有哪些？