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单选题
It shows mourning when you lower（）(半旗).
A
half-mast
B
dip the mast
C
flag line
D
flag mast
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考题
单选题The man page for command shows the following syntax: The man page for command shows the following syntax: command [ -a | -b ] Which of the following statements is true regarding this entry?（）A
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One of the -a or -b flags must be used, but not both at the same time.D
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考题
单选题在船上应当日落时降下国旗.（）A
We should lower national flag when the sun sets.B
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单选题As a duty sailor, he should （）.A
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单选题What is NOT a distress signal?（）A
A continuous sounding of the fog hornB
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flewC
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flies
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