The mechanical efficiency of an engine （） because losses occur in the form of friction.<br>A:is always less than 100%<br>B:is always more than 100%<br>C:is always equal to 90%<br>D:is always less than 90%

The mechanical efficiency of an engine （） because losses occur in the form of friction.
A:is always less than 100%
B:is always more than 100%
C:is always equal to 90%
D:is always less than 90%

出自：海船船员证

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