题目内容

长度为l 的匀质等截面两端自由梁一阶振型的节点(无阻尼自由共振)位于( )

A. 0.224 l
B. 0.5 l
C. 0.776 l
D. 试件边缘处

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A. 测量前需提前读出零位读数
B. 零位读数只能是正值
C. 直接测量的结果应减去零读数修正成合理的结果
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The ticket ____ you to a free medical exam in our hospital once a year.

A. offers
B. entitles
C. grants
D. gives

He is ____ to come at seven, but as a matter of fact, he never comes before eight.

A. compelled
B. acquired
C. supposed
D. suggested

You are allowed to ____ the meeting for ten minutes only, so unimportant details should be left out.

A. speak
B. address
C. exchange
D. explain