单项选择题

A__________is a person who has served and is no longer serving in the armed forces.
A、pensioner
B、senior
C、war veteran
D、war widow

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单项选择题

In the experiment of analysis of nickel plating solution, which method is used to separate and remove the interference of nickel ion on boric acid determination?
A、Filtration method
B、Precipitation method
C、Extraction method
D、Ion exchange separation method

单项选择题

序列，则下列说法不正确的是

A．两序列的和是

B．两序列的积是

C．两序列的卷积和是

D．两序列的差值是