尘肺按病因分类错误的是()A．矽肺 B．棉尘肺 C．石棉肺 D．煤_爱下问搜题

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问题单项选择题

尘肺按病因分类错误的是()

A．矽肺

B．棉尘肺

C．石棉肺

D．煤矽肺

E．煤肺

答案

参考答案：B

选择题

Leonardo da Vinci (1452 - 1519) _____ birds kept in cages in order to have the pleasure of setting them free.

A. is said to be buying
B. is said to have bought
C. had said to buy
D. has said to have bought

选择题

从下列现象中判断，pH最小的是（　　）

A．能使紫色石蕊试液变蓝的溶液

B．能使紫色石蕊试液变红的溶液

C．能使酚酞试液变红的溶液

D．使紫色石蕊和酚酞都不变色的溶液