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【单选题】
拉伸试验时,试样在断裂前所能承受的最大应力称为材料的( )A.
屈服强度
B.
抗拉强度
C.
弹性极限
D.
冲击强度
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【单选题】Li Xiaolan works as a secretary in an American company. One day she worked very late. Her boss said to her, “Thanks a lot. That’s a great help.” Li replied, “It’s my pleasure.”
A.
Appropriate.
B.
Inappropriate.
【简答题】many supermarkets have ______ state of the
【判断题】Li Xiaolan works as a secretary in an American company. One day she worked very late. Her boss said to her, “Thanks a lot. That’s a great help.” Li replied, “It’s my pleasure.”
A.
正确
B.
错误
【判断题】电池的功率是指电池在一定放电制度下,单位时间内输出的能量 ,单位为 。比功率则是指单位质量或单位体积电池输出的功率,单位 为 KW/kg 或 KW/L
A.
正确
B.
错误
【单选题】Li Xiaolan works as a secretary in an American company. One day, she worked very late. Her boss said to her, "Thanks a lot." That's a great help." Li replied, "It's my pleasure."
A.
A
B.
I
【简答题】电功率的单位是_ _ ___,能量的单位是_____。
【判断题】Li Xiaolan works as a secretary in an American company. One day she worked very late. Her boss said to her, "Thanks a lot. That's a great help." Li replied, "It's my pleasure."
A.
正确
B.
错误
【判断题】Li Xiaolan works as a secretary in an American company. One day she worked very late. Her boss said,"Thanks a lot. That's a great help.'' Li replied, "It's my pleasure.''
A.
正确
B.
错误
【简答题】电功率 的国际单位是 ,电能 的国际单位是 ,家庭中使用的电能表(又称电度表)测量的是 (选电能或电功率),单位是 (俗称度)。
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