Which device is designed to automatically hold the load if power should fail to an electric winch?（）<br>A:Pneumatic brake<br>B:Electromagnetic brake<br>C:Hand brake<br>D:Motor controller

Which device is designed to automatically hold the load if power should fail to an electric winch?（）
A:Pneumatic brake
B:Electromagnetic brake
C:Hand brake
D:Motor controller

出自：海船船员证

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