The _____ compressor and its electrical motor are entirely housed in a gas-tight casing.A.

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The _____ compressor and its electrical motor are entirely housed in a gas-tight casing.

A.open-type

B.hermetic

C.A and B

D.None of the above

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。