单项选择题
根据《钢质内河船舶入级与建造规范》,对船长小于、等于30m的船舶的转舵时间急流航区应不大于(),其他航区不大于()。
A.12s,15s
B.12s,20s
C.20s,12s
D.15s,20s
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单项选择题
A.12s,15s
B.12s,20s
C.20s,12s
D.15s,20s
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