碎煤机衬板应完好无缺,无损坏,磨损应不大于衬板厚度的()。
A.4/5;
B.3/4;
C.2/3;
D.1/2。
参考答案:C
用所给动词的适当形式填空。
1. They________(not have) any classes next week.
2. We needn't________(go) to school, and we will study on computers.
3. This land of robots will be fun________(watch).
4. He thought that computers would never________(use) by most people.
5. We are able_________(have) our own robots.
6. Scientists are now trying to make robots________(look) like people.
7.It will be difficult for a robot________(do) the same things as a person.
8.Would you like________(do) such jobs?
9. In the future, there________(be) more robots everywhere.
10. After an efuthquake, a snake robot could help_________(look) for people under buildings.
行政体制的特点主要有()。
A、历史的继承性
B、严格的系统性
C、鲜明的政治性
D、相对的滞后性
E、教强的稳定性