下列化合物中，酸性最强的是（）。 A.Ge（OH）2 B.Ge（OH）4 C.Pb（_爱下问搜题

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问题单项选择题

下列化合物中，酸性最强的是（）。

A.Ge（OH）₂

B.Ge（OH）₄

C.Pb（OH）₂

D.Pb（OH）₄

答案

参考答案：B

选择题

Now the world's attention _____ the stocking markets, as they have great influence in the world's economy.

A. is fixing on
B. has fixed on
C. is being fixed on
D. had been fixed on

选择题

We had wanted to finish our task by noon, but it didn’t quite ________ as planned.

A．carry on

B．carry out

C．work on

D．work out