电嘴中安装附加电阻的主要作用是什么（） A.减弱放电过程中对电极的侵蚀作用 B.当系

根据对话，判断句子正误。（T/F）

Mike: Hello, may I speak to Mrs. White, Mike's teacher?

Mrs. White: Yes, this is Mrs. White speaking. Who's that?

Mike: This is Mike's father. Mike is not well today. He can't go to school.

Mrs. White: I am sorry. OK, he can have a day off (休假一天).

Mike: Oh, I'm so happy. I can stay at home and watch TV now.

Mrs. White: What?

(     )1. Mike's father calls Mrs. White.

( )2. Mike is ill.

( )3. Mrs. White is Mike's teacher.

( )4. Mike's father can have a day off.

( )5. Mike is a good student.

水的净化过程有“沉淀、过滤、吸附、蒸馏和杀菌”等，其中属于化学变化的是（　　）

A．沉淀

B．蒸馏

C．吸附

D．杀菌

出纳人员只能负责款项的收付和记现金，银行日记账外，不能记其他的任何账目。()

下列脑挫裂伤描述，下列哪项是错误的()

A．低密度水肿区出现斑点状高密度出血灶

B．可伴有蛛网膜下腔出血

C．可发生在白质或灰质，不能同时受累

D．病变局部脑池脑沟变小、消失

E．明显占位效应

律诗的第3、4句称为（）。

A、颈联

B、颔联

C、尾联