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【单选题】
重金属检查法中，所使用的醋酸盐缓冲液的pH值是A.
1.5
B.
2.5
C.
3.5
D.
4.5
E.
5.5
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举一反三
【单选题】. Whenever you enter the reading room, you can find all the students _____ at their desks, with their attention _____ on the books, except Tom.
A.
sitting, fixing
B.
to sit, fixed
C.
seating, fixing
D.
seated, fixed
【单选题】Oh, boy, why are you just playing games all day? Can't you find something ______ doing at all?
A.
practical
B.
valuab1e
C.
worth
D.
positive
【简答题】查询商品的id、供应商的id以及单价,要求输出结果的列明为中文。
【简答题】Disney is an amusement park _______ you can find all the normal attractions and Disney movies and characters.
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