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单项选择题

中药饮片的结构鉴别可以采用：
A、化学法
B、光谱法
C、色谱法
D、显微鉴别法

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相关考题

单项选择题
The basic idea of present value of multiple cash flows calculated by discounting back one period at a time is
A、from the farthest cash to discount back one period and plus the previous period cash flow, then to discount back one period again and then plus the previous period cash flow, and to continue the preceding process until present value is calculated
B、from the farthest cash to discount back one period, then to discount back one period again, and to continue the preceding process until present value is calculated
C、from the farthest cash to compound and plus the previous period cash flow, then to compound again and then plus the previous period cash flow, and to continue the preceding process until present value is calculated
D、from the farthest cash to compound, then to compound again, and to continue the preceding process until present value is calculated
单项选择题
2. The underlined word "proper" in the second paragraph means__________. 
A、small
B、big
C、right
D、wrong 无解析
不定项选择
载流导线在磁场中移动和载流线圈在磁场中转动时，安培力一定做功。
A．正确
B．错误
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