在一定体积pH=12的Ba(OH)2溶液中，逐滴加入一定物质的量浓度的NaHSO

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问题选择题

在一定体积pH=12的Ba(OH)₂溶液中，逐滴加入一定物质的量浓度的NaHSO₄溶液，当溶液中Ba²⁺恰好完全沉淀时，溶液pH=11，若反应后溶液体积等于Ba(OH)₂溶液与NaHSO₄溶液的体积之和，则Ba(OH)₂溶液与NaHSO₄溶液的体积比是[ ]

A．1︰9

B．1︰1

C．1︰2

D．1︰4

答案

答案：D

单项选择题

This passage is on the whole ______.

A．narrative

B．instructive

C．prescriptive

D．argumentative

选择题

The poor boy was ________ by his grandparents.[ ]

A. brought forward

B. brought in

C. brought up

D. brought about