单项选择题
What happens if the man finds the book on the list of Books in Print?
A.They can order it for him if it's not in stock.
B.They can give it to him as a special reward.
C.They can buy it for him at his own charge.
A.They
B.
B.They
C.
C.They
D.
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单项选择题
How late was the flight from Bangkok?A.Two hours.B.One hour.C.Half an hour.
A.Two
B.
B.One
C.
C.Half
D.
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单项选择题
原子吸收光谱法测定钙时磷酸根有干扰,为消除其干扰,可采取的措施( )。(1)加入铝盐,(2)加入锶盐,(3)加入EDTA,(4)使用N2O-C2H2火焰
A.(1)、(2)、(3)
B.(1)、(2)、(3)、(4)
C.(2)、(3)、(4)
D.(2)、(4)
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