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单选题
A signal indicating zone time is preceded with the letter（）.
A
L
B
N
C
T
D
Z
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Which of the following datatypes store time－zone information in the database?()
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If you are on the beach and are signaling to a small boat in distress that your present location is dangerous and they should land to the left，you would ______．A.fire a green star to the leftB.send the letter K by light and point to the leftC.place an orange signal to your left as you signal with a white lightD.send the code signal S followed by L
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单选题A 95-meter vessel aground sounds which fog signal? （）A
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danger，stay awayB
all is clear，it is safe to passC
all is clear，it is safe to approachD
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danger，stay awayB
all is clear，it is safe to passC
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a distress signal
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vertical motion of white flagsB
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None of the above
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