单项选择题

Which of the following tensioning devices is used with webbing to secure light vehicles aboard Ro-Ro vessels ________．
A.Chain lever
B.Buckle tensioner
C.Adjust-a-matic tensioner
D.Turnbuckle

A.A.Chain
B.Buckle
C.Adjust-a-matic
D.Turnbuckle
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单项选择题
A.B.C.D.与电路的外加激励U有关
A.
B.
C.
D.与电路的外加激励U有关
单项选择题
A.－1B.＋1C.－2D.＋2
A.－1
B.＋1
C.－2
D.＋2
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