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The metal sheet used to imitate thunder must be________．
A．tightly fastened on all sides
B．lying flat
C．both A and B
D．neither A nor B
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更多 “ The metal sheet used to imitate thunder must be________．A．tightly fastened on all sidesB．lying flatC．both A and BD．neither A nor B ” 相关考题
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单选题Which statement concerning reserve sources of energy for GMDSS is FALSE（）.A
While the ship is at sea，there must be available at all times a supply of electrical energy sufficient to operate the radio installations and to charge any batteries used as part of a reserve source of energyB
Both the VHF and MF/HF installations must be simultaneously suppliedC
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qchk -AC
enq -s ALLD
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单选题A （）(钢丝刷) should be used on all bare metal to remove the last of the scale.A
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单选题All wire rope used in shipboard cargo gear must be identified and described in a certificate. The certificate shall certify all of the following EXCEPT the（）.A
date of the testB
load at which a test sample brokeC
name of the vesselD
number of strands and of wires in each strand
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