单选题船舶通过冰区航行过程中,冰量为()以下时,可常速航行。A4/10~5/10B5/10~6/10C6/10~7/10D7/10~8/10
单选题
船舶通过冰区航行过程中,冰量为()以下时,可常速航行。
A
4/10~5/10
B
5/10~6/10
C
6/10~7/10
D
7/10~8/10
参考解析
解析:
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