钻孔式开铁口机，它主要由回转机构，推进机构和钻孔机构三部分组成。
参考答案：对
What do you think of his proposal that some measures______to improve the working conditions
A．would be taken
B．be taken
C．will be taken
D．will have to be taken
某工程双代号施工网络计划如下图所示，该进度计划已经获监理工程师审核批准，合同工期为22个月。
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