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单项选择题

采用2，4-二硝基苯肼法测定食物中维生素C时，加入的活性炭为（ ）

A．脱色剂
B．还原剂
C．氧化剂
D．干燥剂
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相关考题

单项选择题
CIRCUIT SWITCHING
Consider the circuit-switched network shown in the figure below, with circuit switches A, B, C, and D. Suppose there are 14circuits between A and B, 14 circuits between B and C, 15 circuits between C and D, and 13 circuits between D and A.
Suppose that 17 connections are needed from A to C, and 11 connections are needed from B to D. Can we route these calls through the four links to accommodate all 28 connections?
HINT Taking from the previous question, is the sum of the two connections greater than the value we calculated in question 2?
A、Yes
B、No
判断题
等比递增现值公式为P=G1[P/G1,i,j,n
多项选择题
Listening to a short passage and choose the best answer to each question you hear.
Listening to a short passage and choose the best answer to each question you hear.
Listening to a short passage and choose the best answer to each question you hear.
Listening to a short passage and choose the best answer to each question you hear.
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