深孔爆破是指孔深H、孔径R符合以下（）条件的钻眼装药爆破。 A.

搜题请搜索小程序“爱下问搜题”

问题单项选择题

深孔爆破是指孔深H、孔径R符合以下（）条件的钻眼装药爆破。

A.H>5m，R<75mm

B.H>5m，R>75mm

C.H<5m，R<75mm

D.H<5m，R>75mm

答案

参考答案：B

单项选择题

The boss took it for granted that his secretary should keep him well-informed.

A．assumed that it was true without doubt

B．believed that it was true without making sure

C．agreed that it was necessary

D．thought that it was beneficial

选择题