将41×2.25mm的管坯拉伸至35×1.8mm的变形是()。
A.弹性变形
B.塑性变形
C.热变形
D.机械变形
参考答案:B
土石方工程中采用较多的是______降水。
A.深井泵
B.明排水法
C.喷射井点
D.轻型井点
E.电渗井点
Mothers holding jobs outside the home should have __________ schedules to make it easier to care
for their children. [ ]
A. heavy
B. smooth
C. flexible
D. complex