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手持电动工具由作业人员自带，工具安全由作业人员自己负责。()

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木工机械只准使用单向开关，闸刀开关是单向开关，可以使用。()

Under the Carriage of Goods by Sea Act of 1936，a vessel will be liable for damage to cargo

An act of war
B. Lack of ventilation in transit
C. Perils of the sea
D. An error in navigation

Where are self-closing doors required on a ship ________．

A. In the galley
B. In each stair tower
C. To each sleeping room
D. To the engine room

The vessel shall be employed in such lawful trades between safe ports and places within Northern America as the ______ or their agents shall direct．

A. Charterers
B. Cargo owners
C. Owners
D. The merchants