You should NOT use a power tool if ().
A.It has a three-prong plug
B.The insulation of the power wires is worn
C.Hand tools can be used instead
D.The power source is alternating current
第1题
A.a floodlight
B.two red lights in a vertical line
C.a single red light
D.any visible lights
第2题
A.The rules require vessels to comply with Traffic Separation Scheme regulations
B.The rules use the term safe speed
C.The Rules permit a stand-on vessel to take action prior to being in extremis.
D.All of the above are correct
第3题
A.Any sailing vessel with propelling machinery
B.Any vessel propelled by machinery
C.Any sailing vessel with or without machinery for propelling
D.Any sailing vessel with propelling machinery not in use
第4题
A.Altitude
B.Zenith
C.Declination
D.Zenith distance
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