下列哪种类型的牙齿适于切断植物纤维[ ] A.门齿 B.臼齿 C.犬齿 D.三种

题型:选择题

问题:

下列哪种类型的牙齿适于切断植物纤维[ ]

A.门齿

B.臼齿

C.犬齿

D.三种都是

考点:动物的形态结构和功能
题型:选择题

单词拼写。

     根据下列句子及所给汉语注释,写出空缺处各单词的正确形式(每空只写一词)

1.                  (陪同)by the dean,they visited all the students on the playground.

2. We all have great                  (同情) for the victims of the Wenchuan earthquake.

3. Tens of thousands of people have been forced to                  (放弃,遗弃) their homes

    since the civil war broke out.

4. Fresh air is                   (有益的) to our health.

5. One of his                   (志向;雄心) is to become a famous actor.

6. Mr. Smith sent me the                  (相关的) papers on the topic.

7. The students are busy                  (分发) brochures to passers-by to raise the awareness

of environmental protection.

8. There's an                  (丰富的) supply of fruit at this time of year.

9. The old man                  (捐赠) 15,000 yuan to the disaster-hit area.

10. She has a very good                  (关系) with her classmates.

题型:选择题

下列仪器中,可以在酒精灯火焰上直接加热的是(  )

A.试管

B.集气瓶

C.蒸发皿

D.烧杯

题型:选择题

某同学设计提纯工业酒精的实验装置如图。请指出两处典型错误并更正 (不必再画图)。

① _________________。

②_________________ 。

题型:选择题

“谁是我们的敌人谁是我们的朋友这个问题是革命的首要问题。”这句著名论断出自毛 * * 所写的______。

A.《论联合政府》
B.《中国社会各阶级的分析》
C.《井冈山的斗争》
D.《反对本本主义》

题型:选择题

固定式推力轴承主要承受径向载荷。

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