Certain requirements must currently be met by a ship’s steering system.There must be （）independent means of steering, although where two identical power units are provided, an auxiliary unit is not required.<br>A:one<br>B:two<br>C:three<br>D:four

Certain requirements must currently be met by a ship’s steering system.There must be （）independent means of steering, although where two identical power units are provided, an auxiliary unit is not required.
A:one
B:two
C:three
D:four

出自：海船船员证

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