The difference between the titrations represents（）sodium hydroxide required.
A.a quantity of
B.the amount of
C.the quality of
D.an amount of
正确答案：the amount of
The difference between the titrations represents（）sodium hydroxide required.
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In the British Pharmacopeia, RS stands for:（）.
Boil 0.5 g of the powdered tablets for 2 to 3 minutes with 10 mL of 5 M sodium hydroxide, cool and add an excess of 1 M sulfuric
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