2051
A.1.24B.1.23C.1.21D.1.22E.1.20 以下数字修约后要求保留三位有效数字
参考答案:C
解析:101~103.有效数字修约要求。
— Who is late for class again?
— _____ you ask? Tim, of course. [ ]
A. Can
B. Would
C. Could
D. Need
铡刀剪剪刃间隙过小易使剪刃发生碰撞,损坏剪刃;间隙过大则钢板切口不平,使剪切能耗增大。