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第1题

5. 已知各水平杆和竖直杆的长度均为l,图示桁架1杆的轴力是( )(本题3.0分) A、√5/4p B、 - √5/2p C、√5/2p D、- √5/4p
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第2题

I am looking forward to _______from you as soon as possible. A.hear B.be hearing C.hearing D.have heard
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第3题

As Edison grew_____, he became more and more interested in science. A.elder B.the elder C.older D.the older
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第4题

The fireman _________great courage in saving the children. A.extend B.contact C.offer D.demonstrate
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