安全工作规程中规定:安全电流为()以下.
A、5mA
B、10mA
C、20mA
D、30mA
参考答案:B
用所给词的正确形式填空。
l. My teacher devoted herself _____ (research)education.
2. When he_____ (finish) school, he studied physics in Switzerland.
3.Stop_____ (make) so much noise! The baby is sleeping.
4. Let's_____ (invite) her friend to my party.
5.Thanks to the teachers, I have _____ (catch) up with my classmates.
下述说法哪个是错误的?()
A.中国采用国际专利分类法对发明专利申请进行分类
B.中国采用国际专利分类法对实用新型专利申请进行分类
C.中国采用洛迦诺分类法对实用新型专利申请进行分类
D.中国采用洛迦诺分类法对外观设计专利申请进行分类