建筑基坑工程监测技术规范:地下水位变化速率超过()应进行报警
A.250mm/d
B.500mm/d
C.750mm/d
D.1000mm/d
参考答案:B
____ we is known to all, English is not very difficult to learn.
A.What
B.As
C.That
D.Which
焊补裂纹时,为防止裂纹蔓延,两端应钻直径为10~15毫米的止裂纹。