减压蒸馏正确的操作是()。
正确答案:将真空蒸馏的排气管通至厂房外;管道上安装阻火器;要经常检查真空蒸馏设备的密闭性
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单项选择题
Through Abbas, Xuanhui and Jialin’s group discussion, we gained a better understanding of _______ in China.
Through Abbas, Xuanhui and Jialin’s group discussion, we gained a better understanding of _______ in China.
A.places of interests
B.antiques of high value
C.world heritage sites
D.history and culture