题目内容
(请给出正确答案)
[单选题]
砼坍落度<=30mm,用强制式搅拌机最短搅拌时间().
A.30s
B.60s
C.120s
D.180s
单选题,请选择你认为正确的答案:
提交
查看答案
![](https://lstatic.shangxueba.com/sxbcn/h5/images/tips_org.png)
A.30s
B.60s
C.120s
D.180s
第9题
A.60-100s
B.80-100s
C.80-120s
D.100-140s
为了保护您的账号安全,请在“赏学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!