注水泥塞施工过程中,如果提升系统发生故障不能提放,应立即洗井,替出井内灰浆。
参考答案:对
I your success although you are in difficulty now.
A.am sure of
B.make sure
C.am sure that
D.make sure that
冷冻最适宜的温度范围为()。
A.0℃以下
B.-10℃以下
C.-15℃以下
D.-18℃以下