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【简答题】
安全系统工程的主要内容包括以下四个方面，即事故致因理论、系统安全分析、安全评价和安全措施。其核心内容是__。
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举一反三
【单选题】They went on well at first but eventually everything they worried about happened.
A.
which
B.
what
C.
that
D.
when
【单选题】A sample of 200 students at a Big-Ten university was taken after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying, and whether they di...
A.
15
B.
27.27
C.
30
D.
50
【单选题】A sample of 200 students at a Big-Ten university was taken after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying, and whether they di...
A.
15
B.
27.27
C.
30
D.
50
【单选题】They went on well at first but eventually everything ______ they had worried about happened．
A.
which
B.
what
C.
that
D.
When
【单选题】They went on well at first but eventually everything ______ they had worried about happened．
A.
which
B.
what
C.
that
D.
when
【单选题】（ 18 ）有如下程序段： Tnt i=4int j=l int main （） { int i=8 ， j=i cout$amp } 运行时的输出结果是
A.
） 44
B.
） 41
C.
） 88
D.
） 81
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