同一专业工程队在各个施工段上的劳动量应大致相同,其相差幅度不宜超过()。
A.5%~10%
B.5%~15%
C.10%~15%
D.10%~20%
参考答案:C
Please don't ____. I'm sure that you'll do better next time. [ ]
A. lose your heart
B. lose hearts
C. lose heart
D. lose your hearts
流体有层流和紊流,发电厂的汽、水、风、烟等各种流动管道系统中的流动,绝大多数属于()运动。