引起矿井火灾的基本条件?
参考答案:
热源、可燃物和新鲜空气
In the wartime, the masses devoted whatever they had to _____ the army in fighting
against the Japanese. [ ]
A. have supported
B. support
C. having supported
D. supporting
硬质合金中,碳化物含量越高,钴含量越低,则其强度及韧性越高。