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【单选题】
关于应力应变的概念错误的是（ ）A.
应变的常用单位是 mm
B.
应变没有单位
C.
应力的常用单位是 MPa
D.
应力和应变都是一个微观量
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】She was surprised to find the house _____ into when she went back home.
A.
broke
B.
broken
C.
break
D.
breaking
【简答题】14+15+16+17+18+19+20+21 1233+1266+34．
【简答题】口算 20×31= 34×10= 33×30= 34+17= 240÷2= 19×50= 14×20= 50×11= 30×80= 40×50= 14×60= 46×20= 0×30= 42-17= 38+19=
【简答题】Mary was an operator (接线员) 911 in Los Angeles. One Thursday morning, she was surprised to get a call from a young child who said, “Mom my ill, Mom my ill, ” again and again. Mary hurried to find the a...
【简答题】Mary was an operator(接话员) 911 in Los Angeles. One Thursday morning, she was surprised to get a call from a little girl. She said, “Mom my ill, Mom my ill,’ again and again, Mary soon found the address...
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