If no gaskets are used in the piping joints of a Freon system, the joints must be（）<br>A:finished joints<br>B:welded joints<br>C:ground joints<br>D:soldered joints

If no gaskets are used in the piping joints of a Freon system, the joints must be（）
A:finished joints
B:welded joints
C:ground joints
D:soldered joints

出自：海船船员证

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