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【简答题】
Fill in the blanks with the words given below. Change the form where necessary. contact previous inspire neglect confirm substitute urgent remarkable 1. He looked around to ________ that he was alone. 2. These children were in a state of virtual ________. 3. I am unable to attend the meeting because of a ________ engagement. 4. His encouraging remarks ________ confidence in me. 5. Home-made parts are being ________ for imported ones. 6. These people are in ________need of relief. 7. He tried to get into ________ with the local branch. 8. The Tang Dynasty is a period __________ for its liberality.
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皮皮学刷刷变学霸
举一反三
【简答题】常数的极限为____ 。
【单选题】连续生产的电子管厂,产品质量检验是这样安排的,在一天中,每隔一小时拍取5分钟的产品进行检验,这是( )
A.
简单随机抽样
B.
分层抽样
C.
等距抽样
D.
整群抽样
【简答题】在如图所示某零件的许用极限应力图中,ABS为疲劳极限曲线,M点为零件的工作应力点,下列3种情况下的极限应力点分别为: (1)应力比为常数时,极限应力点为_______; (2)平均应力为常数时,极限应力点为_______; (3)最小应力为常数时,极限应力点为________。