In an emergency，the electro-hydraulic steering units can be directly controlled by the（）.<br>A:trick wheel<br>B:rapson slide<br>C:follow-up gear<br>D:receiver unit

In an emergency，the electro-hydraulic steering units can be directly controlled by the（）.
A:trick wheel
B:rapson slide
C:follow-up gear
D:receiver unit

出自：海船船员证

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