题目内容
（请给出正确答案）
A.气温低于4℃时，不应进行喷射作业
B.喷射作业应分段、分片，自下而上依次进行
C.分层喷射时，后一层喷射应在前一层混凝土终凝后进行
D.喷射与开挖循环作业时，混凝土终凝到下一循环放炮的时间间隔不应小于3h
E.喷射机司机和喷射手的操作应遵守规范规定
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第2题
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C．The smaller, the more valuable.
第3题
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第4题
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第9题
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