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【单选题】
Which statement is TRUE concerning the danger signal?（）.A.
When any vessel fails to understand the intentions of an approaching vessel she must sound the danger signal
B.
Only the stand-on vessel can sound the danger signal
C.
Distress signals may be used in place of the danger signal
D.
The danger signal consists of 4 or more short blasts of the whistle
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【单选题】I failed in the last exam and only then __________ the importance of studies.
A.
I realized
B.
I had realized
C.
had I realized
D.
did I realize
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A.
项目问题的影响程度和范围
B.
决策目标的数量
C.
决策问题重复情况
D.
决策问题所处的条件不同
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A.
正确
B.
错误
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A.
reads, did
B.
reading, didn't
C.
read, didn't
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