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计算当月销售B化妆品应缴纳的销项税额；

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新建高炉的除尘器应位于高炉铁口、渣口()以外的地方。
A 100米
B 50米
C 10米

发生炉炉煤气一氧化碳含量是()%，所以极具危险性。
A 23至30
B 27至31
C 50至65
D 60至64

The ability of innovative thinking greatly accelarateds the speed of natural evolution,which brings about great achievements in human civilization,such as art,literature,medicine,technology,especially in science which symbolizes the forefront of the expansion of human intelligence. However, it is such scientific advancements that enable humans to earn capacity of self-destruction,and cause the development of tools for self-destruction.

罗茨加压机不能通过()调节加压机的煤气输送量。
A 变频器
B 加压站回流阀
C 加压机出口阀门