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单选题
When the union purchase derrick is operated, one derrick is positioned over the quayside and the other almost vertically over the ().
A
dock
B
hold
C
pedestal
D
machinery space
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单选题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°
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Crane/derrick cyclesC
Crane/derrick cycle timeD
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Two derricksB
A derrick and a craneC
Two cranesD
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stringB
standC
jointD
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angelB
lengthC
heightD
angle
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taken inB
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adjustedD
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Lower the derrick, please.B
Top the derrick, please.C
Swing the derrick, please.D
Adjust the derrick, please.
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slackC
heightD
rotation direction
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A holdC
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单选题Be careful when you ()the derrick.A
operatedB
operateC
operatingD
operator
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