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【单选题】
接触器自锁控制线路不但能使电动机连续运转,而且还具有-----保护作用A.
欠压)
B.
失压
C.
零压
D.
欠压和失压(或零压)
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【单选题】A chain bridle is preferable to a wire rope towing bridle on a long ocean tow because chain ______.
A.
is more flexible and has the ability to absorb shock because of its weight
B.
is less subject to wear and damage from abrasion
C.
requires little maintenance
D.
All of the above
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