In the （） refrigeration compressor one end of the crank shaft extends through the crankcase house for connection, via a coupling or pulley, to an external drive motor.<br>A:open-type<br>B:hermetic<br>C:semi-hermetic<br>D:all the above

In the （） refrigeration compressor one end of the crank shaft extends through the crankcase house for connection, via a coupling or pulley, to an external drive motor.
A:open-type
B:hermetic
C:semi-hermetic
D:all the above

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