单选题冰区航行,船舶应尽可能从冰区的()方向接近冰区,并尽量选择在冰块的处用慢速直角驶入。A上风,凹陷B上风,突出C下风,凹陷D下风,突出
单选题
冰区航行,船舶应尽可能从冰区的()方向接近冰区,并尽量选择在冰块的处用慢速直角驶入。
A
上风,凹陷
B
上风,突出
C
下风,凹陷
D
下风,突出
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