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单选题
单轴系大多用于（）。Ⅰ.大型海船；Ⅱ.内河中、小船舶；Ⅲ.军舰；Ⅳ.拖船；Ⅴ.客船。
A
Ⅱ＋Ⅲ
B
Ⅰ＋Ⅱ
C
Ⅰ＋Ⅱ＋Ⅲ
D
Ⅰ＋Ⅱ＋Ⅳ
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参考解析
解析：
单轴系多用于大型 海船、拖轮及内河中小型船舶。
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