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单选题
A yellow signal floating in the air from a small parachute，about 300 feet above the water，would indicate that a submarine（）.
A
has fired a torpedo during a drill
B
is about to rise to periscope depth
C
is on the bottom in distress
D
is disabled and unable to surface
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monitoring signalB
inverse signalC
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单选题A yellow signal，floating in the air from a parachute，about 300 feet above the water，indicates that a submarine（）.A
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考题
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rising air currents produced by the warm islandsB
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placing floating booms around the shipC
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单选题The color _____ from yellow through green to black.A
consistsB
constitutesC
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yellowish flameB
golden yellow flameC
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alternating red and yellow lightB
alternating white and yellow lightC
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all-round white light only
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单选题A light used to signal passing intentions must be an （）.A
all-round yellow light onlyB
all-round white light onlyC
all-round blue light onlyD
alternating red and yellow light
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