建筑物和构筑物地面下的填方或厚度( )的填方，应清除基底上的草皮和垃圾。
A．＜0.5mB．＜0.8mC．＜1.2mD．＜1.5m
参考答案：A
Sandy didn’t tell her parents that she was going home because she wanted to give them a _______.
A．gift
B．call
C．surprise
D．note
减少水锤现象发生的方法有哪些？
