在征得用户同意后,尽量参考用户意见,在门头处用电锤帮用户打孔,穿孔直径需控制在()左右,完成后用白泥进行回填。
A.1cm
B.2cm
C.1.5cm
D.2.5cm
参考答案:B
-----He should have come to join in the thorough cleaning.
-----He________, I think. It’s not his turn.
A.needn’t have to
B.needn’t have
C.didn’t have to
D.doesn’t need to
压缩空气泡沫消防车优点的是()。
A.灭火效率高
B.用水少
C.环保
D.便宜
E.不易操作