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【单选题】
人体结石有多种，其中一种含有较多的草酸钙（CaC 2 O 4 ），CaC 2 O 4 中碳元素的化合价是（ ）A.
+1
B.
+2
C.
+3
D.
+4
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【简答题】使用JXGL数据库(使用exists) 查询本学期不及格的学生名单
【单选题】Project Risk Management is based on which of the following premises:
A.
the future is unknown.
B.
unknowns can result in risks or opportunities.
C.
we cannot control risk s.
D.
project risk impact can be measured and controlled
E.
All of the above.
【单选题】Which of the following is NOT true about Greece?
A.
Its economy is based on exports.
B.
It is very likely to be the next Dubai.
C.
Its people have realized their situation.
D.
Its debt rating is the lowest in the euro zon
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