问题
选择题
— I telephoned him twice and I couldn't get through to him.
— I think that the line might have been out of order, _____ ?[ ]
A. don't you
B. wasn't it
C. mightn't it
D. hadn't it
答案
答案:B
— I telephoned him twice and I couldn't get through to him.
— I think that the line might have been out of order, _____ ?[ ]
A. don't you
B. wasn't it
C. mightn't it
D. hadn't it
答案:B
(共四套,分为矿山安全技术、建筑安全技术、危险化学品安全技术和综合安全技术,考生任选一套即可)
矿山安全技术 |
煤的自燃倾向性是煤的—种自然属性,是煤层发生自燃的基本条件。煤的自燃倾向性分为( )三类。
A.容易自燃、自燃和不易自燃
B.容易自燃、不易自燃和不自燃
C.自燃、不易自燃和不自燃
D.易自燃、不易自燃和不自燃