量热计热容量的测定中,“氧弹充氧”这步如何操作?
①卸下氧弹盖上的进出气螺栓及垫片,旋上导气管接头,并用板手拧紧;
②关闭(逆时针)氧气钢瓶的减压阀;
③打开(逆时针)氧气钢瓶总阀门,至指针指向10Mpa左右;
④打开(顺时针)氧气钢瓶的减压阀;使指针指向2.5Mpa→充氧1min;
⑤关闭(逆时针)氧气钢瓶的减压阀;
⑥用板手旋松导气管接头,取出。垫上垫片,拧紧螺栓。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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