为患者进行中心静脉导管维护时，操作不正确的是（）A、操作前评估导管固定情况 B、更换

双香豆素过量引起的出血可用（）。

A.硫酸鱼精蛋白

B.叶酸

C.维生素K

D.尿激酶

E.维生素B₁₂

静电喷涂是以被涂物为正极(接地)，喷涂机为负极，在两极间加上直流电压形成静电场，当静电场的电场强度达到一定值时，电场附近的空气发生电晕放电，从而使空气发生( )；雾化的涂料颗粒通过该电场成为带电颗粒。并在静电场的作用下连续不断地涂覆到作为正极的工件表面。

A．电解

B．电离

C．电磁

D．电流

Directions:

Suppose you are the secretary of the principal of your university. You are expected to write a memo to remind the principal of an important international meeting he has to attend the next day. Imagine some detailed activities the principal has to perform in the meeting.

Write your memo in no less than 100 words. Write it neatly on ANSWER SHEET 2.

Do not sign your own name on the memo; use Li Hua instead.

Do not write the address. (10 points)

ISDN解决了用户环路的数字传输问题，可在现有铜线上传输语音、数据、视频，实现端到端的数字化