Before the operation of the derrick, check all （）(索具)closely and everything must be in good condition.<br>A:blocks<br>B:goosenecks<br>C:tackle<br>D:guys

Before the operation of the derrick, check all （）(索具)closely and everything must be in good condition.
A:blocks
B:goosenecks
C:tackle
D:guys

出自：船舶水手证

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