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【单选题】
用原子吸收光度法测定铜的灵敏度为 0.04ug/mL (1%) ,当某试样含铜的质量分数约 0.1% 时,如配置成 25.00mL 溶液,使试液的浓度在灵敏度 25~100 倍的范围内,至少取的 试样为 ( ) 。A.
0.001g
B.
0.010g
C.
0.025g
D.
0.100g
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【简答题】The use of computers and computer-related technologies are more and more important ______.
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【单选题】More and more students will use computers to learn in the near future. (就划线部分提问)
A.
What will more and more students use to learn in the near future?
B.
How will more and more students use to learn in the near future?
C.
What will more and more students use computers to learn in the near future?
【单选题】The more frequently farmers use insecticides, the more ______ insects will become to the chemicals.
A.
resistant
B.
available
C.
sensitive
D.
agreeable
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