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【单选题】
中国药典 (2015 年版 ) 规定,在砷盐检查时,取标准砷溶液 2.0mL(1mL 相当于 1μgAs) 制备标准砷斑。现依法检查氧化钠中含砷量,规定其限度为 0.00004% ;则应取供试品的质量是 ( ) 。A.
0.5g
B.
0.50g
C.
5g
D.
5.0g
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皮皮学刷刷变学霸
举一反三
【单选题】The deer has four _________. A. foot B. feet C. foots 2. Her two brothers are both _________. A. policeman B policemans C. policemen 3. There are four ___________ and two _________ in the...
A.
foot
B.
feet
C.
foots
【简答题】The deer has four _________.(foot) 2. Her two brothers are both _________(policeman). 3. There are four ___________ (Japanese) and two _________(German) in the group. 4. Can you see nine _________(hor...
【简答题】The deer has four _________.(foot)
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