Help me with two questions

2018-06-10 View Original

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1. Screw compressors can be controlled by slide valves ( ), without affecting ( ). The characteristics of screw compressors are the absence of ( ), high efficiency, and no vulnerable components such as suction or discharge valves; ammonia compressors usually use ( ) screw compressors. 2. Before starting the turbine, it is necessary to carry out ( ) ； Throw ( ) ； Send ( ); Draw ( ). They are all fill-in-the-blank questions, haha: handshake

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Help me with two questions

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