直流单臂电桥又称为惠斯登电桥，能准确测量大值电阻。
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A towing vessel pushing a barge ahead and rigidly connected in a composite unit shall show the lights of（）.
A. a vessel towing by pushing ahead
B. a power-driven vessel，not towing
C. a barge being pushed ahead
D. either answer A or answer B
在岗和脱产培训是企业的主要培训方式。
A. 正确
B. 错误
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