钢筋混凝土井塔爬模施工法的特点是()。
A.起重机吊装工作量大
B.施工精度高、质量好
C.因分层施工而结构整体性差
D.爬升时无需支承杆
参考答案:B
解析:
—Was it there _______ you were away to answer the phone? —There is no doubt about it.
A.that
B.which
C.while
D.where
煤矿防治水工作的第一责任人是谁?