机组氧气压力指示器使用的电源为（）。A.28VDC电瓶汇流条 B.28VDC直流汇流 发布时间：2017-04-25 08:37 │ 来源：www.tikuol.com 题型：单项选择题 问题： 机组氧气压力指示器使用的电源为（）。A.28VDC电瓶汇流条B.28VDC直流汇流条C.115VAC汇流条D.115VAC备用汇流条
题型：单项选择题 短文改错。As the development of the Internet, more and more people tend to send out e-cards instead of paper ones to their friends when an important holiday came. Comparing with traditional cards, e-cards are lively and interesting. They can give us not pictures but sounds. However, it is faster to send an e-card 6.than traditional cards. There is a variety of cards on line which you can choose. With the popularity of e-cards, less paper is used as making paper cards, it is better for our environment. In short, use e-cards as possible as we could. Using e-cards should be accepte by more people, not the young alone. 1. _____2. _____3. _____4. _____5. _____6. ______7. _____8. _____9. _____10. _____ 查看答案