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简述维生素的特点。

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冷粘法是指用()粘贴卷材的施工方法。

A. 喷灯烘烤
B. 胶粘剂
C. 热沥青胶
D. 卷材上的自粘胶

生产班组应定期进行作业风险评估,以适应工作中的变化。()

A. 正确
B. 错误

Which of the following operating features do displacement pumps bear if they are working under no-cavitation condition?() (1) output is almost directly proportional to speed (2) they are self-priming (3) they will develop a discharged pressure equal to the resistance to be overcome, irrespective of speed

A. (1)and(2)
B. (2)and(3)
C. (1)and(3)
D. (1),(2)and(3)

泻心汤中并无止血之品,为何能主治衄、吐血证?

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