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【单选题】
结构设计时,取( )作为钢材的标准强度A.
抗拉强度
B.
屈服极限
C.
比例极限
D.
弹性极限
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举一反三
【单选题】“ I know she was in because I heard her radio, but she didn’t open the door” “She ____ the bell.”
A.
mustn’t have heard
B.
may not have heard
C.
needn’t have heard
D.
can’t have heard
【单选题】" I know she was in because I heard her radio. but she didn't open the door." "She_______ the bell . "
A.
mustn't have heard
B.
may not have heard
C.
needn't have heard
D.
can't have heard
【单选题】I heard that she apples if she was free the next day.
A.
was picking
B.
will pick
C.
is going to pick
D.
was going to pick
【简答题】微机型故障录波装置由哪几部分组成，各组成部分有何作用？
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