在基坑或沟槽开挖时,对于松散、湿度大的土可用( )支撑。
A.连续式水平挡土板B.断续式水平挡土板C.垂直挡土板D.水平式挡土板
参考答案:A
— I'm sorry. I shouldn't been so angry with you that day.
— ______. I was a bit out of control myself.[ ]
A. That's right
B. All right
C. Forget it
D. Got it
采血秤的混合频率应为每分钟()。
A.10~15次
B.15~20次
C.20~25次
D.25~30次
E.30~35次