You can swing the derrick to starboard side or port side. But do not exceed （）for the union purchase.<br>A:120°<br>B:90°<br>C:60°<br>D:100°

You can swing the derrick to starboard side or port side. But do not exceed （）for the union purchase.
A:120°
B:90°
C:60°
D:100°

出自：船舶水手证

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