材料的杨氏模量是工程技术中常用的设计参数之一。下面哪些方法可以测量材料的杨氏模量( )
A. 拉伸法
B. 弯曲法
C. 共振法
D. 弹性波速测量法
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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
以下关于螺旋测微器使用正确的是( )
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
D. 用毕还原时,测量砧台与测量螺杆间应留有空隙,以免热胀使螺杆变形
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