Free communication effect is in direct proportion to（）.<br>A:length and width of space<br>B:length of space only<br>C:width of space only<br>D:neither length nor width

Free communication effect is in direct proportion to（）.
A:length and width of space
B:length of space only
C:width of space only
D:neither length nor width

出自：海船船员证

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