开挖桩孔应()进行,每层高度应严格按设计要求施工,不得超挖。每节筒深的土方应当日挖完。
参考答案:逐层
—Would you like to have dinner with us?
—______ . [ ]
A. You are welcome
B. I like chicken very much
C. I’d love to. Thanks.
D. The restaurant is very far from my house
预知性修理就是通过设备故障诊断仪器的测量,预先知道没备的运行状况、传动元件的失效状况、刀具的磨损状况等,然后选取修理作业形式并确定时间。