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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

选择题

—Tell me              about Brother Sharp, please.

—He was a beggar (乞丐). He became a blue-eyed boy (红人) on the Internet because of his cool appearance

   and dressing style. [ ]

A. nothing

B. anything

C. something

D. everything

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单项选择题

成人肺结核最可靠的诊断依据是

A．低热、咳嗽、乏力、盗汗
B．血沉增快
C．结核菌素试验阳性
D．胸片有渗出性阴影
E．活组织病理检查，可见干酪性病灶
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