The development of （） has kept pace with the increasing demands made by the steady rise in power produced by modem marine diesels.<br>A:water<br>B:fresh air<br>C:oils<br>D:gases

The development of （） has kept pace with the increasing demands made by the steady rise in power produced by modem marine diesels.
A:water
B:fresh air
C:oils
D:gases

出自：海船船员证

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