下列药物在低浓度有止痒作用而高浓度有腐蚀作用的是（）。 A.达

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问题单项选择题

下列药物在低浓度有止痒作用而高浓度有腐蚀作用的是（）。

A.达克罗宁

B.苯唑卡因

C.酚

D.炉甘石

E.凡士林

答案

参考答案：C

解析：1%酚有止痒作用，纯酚有腐蚀作用。

阅读理解

根据短文内容判断正(√)误(×)。

Mr. Black has two cats. One is big and the other is small. He likes them very much. One day his

friend Mr. Green comes to see him. He is very surprised. He finds there are two holes in the door,

a big hole and a small hole. He says, "My dear friend, why are there two holes in your door?" "To

let them in and out." Mr. Black answers. "But why are there two holes?" asks his friend. "How can

the big cat go through the small hole?" he says.

( )1. Mr. Black has two small cats.

( )2. Mr. Black only likes the big cat.

( )3. There are two holes in the window.

( )4. Mr. Green finds two dogs.

( )5. The small cat can go through the big hole.

多项选择题

在普通齿轮油中加入适当的极压添加剂以及抗泡沫和防锈等添加剂制成的各种工业齿轮油，具有（）。

A.承载能力较高

B.较好的氧化安定性

C.较好的防腐性

D.较好的抗磨性

E.较好的防锈性