外用杀虫，主治疥疮，内服可助阳通便的药物是()A.硫黄 B.蛇床子 C.肉苁蓉 D.

下列有关放射免疫分析的叙述中，错误的是（）

A.以放射性核素作为标记物

B.是一种定量检测技术

C.主要用于检测抗原

D.最后形成的免疫复合物中的放射性强度与标本中的特测抗原量呈正比

E.定量分析时需同时作标准管

已知如图2，电源内阻不计．为使电容器的带电量增大，可采取以下哪些方法（　　）

①增大R₁  ②增大R₂   ③增大R₃   ④减小R₁．

A．①②对

B．②③对

C．③④对

D．②④对

The sun was just coming up when I headed out to work last May at 6 a.m. Not quite dark but dark enough to need my headlights. I turned onto one of the lonely rural country roads.

Maybe it was because I was listening to the radio, maybe it was because I was already thinking about some projects at work, that I didn’t spot the dark object on the road until I was too late. I ran over it and felt the back left tire pull, and then sink. I stopped and got out of the car.

No mystery here---- my back left tyre was cut like a loaf of bread. Back 50 yards was a piece of sharp iron I had run over. I had never changed a tyre. I looked up the road. Not a car in either direction. The nearest service station was miles away. I threw up my hands. Then I remembered---- my cell phone! I powered it up before realizing, I didn’t know who to call.

Wouldn’t you know it, I spotted a car coming from the opposite direction. The driver slowed as he approached. I guessed he could see I was in trouble. He stopped his car, got out and immediately saw the trouble. “Madam, would you like me to change that tyre for you?” he asked. The man couldn’t have been more friendly. I was frightened out there and he put me completely at ease. “There,” he said, after putting on the spare, “you are all set to go.”

“Good thing for me that you were driving this way,” I told him, as I climbed back into my car.

“Funny you should say that,” he said. “Just like you, I was heading to work, but my job is in the opposite direction. I made a wrong turn at some point. I don’t know what I was thinking.”

小题1:The writer didn’t notice the object on the road because ______.

A．it was rather dark then

B．she didn’t use her headlights

C．there was much traffic

D．she was careless when driving小题2:From Paragraph 4 we learn that______.

A．the writer felt quite anxious

B．no one would like to help the writer

C．the writer was a new driver

D．the cell phone should be powered up小题3:What did the man do when he saw the writer?

A．He stopped and laughed at her.

B．He walked over to frighten her.

C．He helped her without hesitation.

D．He drove away in the opposite direction.小题4:The end of the story tells us that the man ______.

A．went a wrong way

B．felt the writer funny

C．didn’t know what he was doing

D．come specially to help the writer

账套主管负责所选账套的维护工作，主要包括对所选账套进行修改、对年度账进行管理，以及该账套操作员权限的设置等。

刮斗的用途是什么？具体的涂布方法是怎样的？