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【单选题】
检查维生素C中重金属时，若取样量为1.0g，要求含重金属不得过百万分之十，问应吸取标准铅溶液（每1ml=0.01mg的Pb）多少ml（ ）。A.
0.2ml
B.
0.4ml
C.
2ml
D.
1ml
E.
20ml
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【单选题】If the unemployment rate is 6 percent and the number of persons unemployed is 6 million, then the number of people employed is equal to:
A.
100 million.
B.
94 million.
C.
106 million.
D.
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A.
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B.
evident
C.
economic
D.
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