题目内容

关于矿山井下爆破施工,以下做法错误的是()。

A. 不混合使用不同厂家生产的电雷管
B. 非煤矿井下采用正向装药结构
C. 装药前清除炮眼内碎石
D. 水炮泥封眼时将其塞满装药后的炮眼

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The sounds that begin and end the words church and judge are voiceless and voiced ______,respectively. ( )

A. affricates
B. stops
C. velars
D. palatals

加入引气剂的防水混凝土的特点是()。

A. 早期强度高
B. 抗冻性好
C. 抗渗等级高
D. 密实性好

Morphemes which represent such grammatical categories as number, tense, gender, and case are called _______ morphemes. ( )

A. free
B. bound
C. derivational
D. inflectional

The writer mentioned the case of the United States to justify the policy of______.

A. providing financial support overseas
B. preventing foreign capitals control
C. building industrial infrastructure
D. utilizing foreign investment

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