下面关于发动机的HPSOV/高压关断活门描述正确的是（）。A.HPSOV只受启动手柄

今年8月初，位于英国南部的约克郡宣布，当地将建设一座属于英国的华夏主题公园------“中国大观园”，把原汁原味的中国文化带到英国。这[ ]

A．意味着中化文化是当今世界上最优秀的文化

B．有利于展示博大精深、源远流长的中华文化

C．有利于展示中 * * 旺盛的生命力、创造力

D．有利于增强中华文化的国际竞争力和影响力

驱动元件包括电压元件和电流元件，它们的作用是将交变的电压和电流转变为穿过转盘的交变磁通，与其在转盘中感应的（）相互作用，产生驱动力矩使转盘转动。

A、电量

B、电压

C、电阻

D、电流

病毒标本长期保存应置予（）

A.－30℃

B.－70℃

C.－20℃

D.0℃

E.4℃

I remember my math teacher Mr. Young very well. He stood out because the kids made fun of him. He was missing one of his fingers, and always pointed at students with his middle finger.

I was not very good at English and math. No matter how hard I tried, I just could not figure out why I did not understand what all the other kids found so easy to learn.

One day, I was told that if I got one more E on my report card, I would be taken to the" big prison for kids".

I tried really hard for weeks. I just couldn’t understand how to make different parts of members into whole things.

The day before report cards were to come out, I knew that Mr. Young would give me an E ,just like he always did.

I went to Mr. Young and told him that the orphanage was going to send me to the big prison if I got another E on my report card. He told me there was nothing he could do;it would be unfair to the other kids if he gave me a better grade than I had actually earned.

I smiled at him and said, "Mr. Young, do you know how the kids make fun of you because you’re missing your finger" He looked at me, moved his mouth to one side and said nothing.

"They shouldn’t do that to you because you can’t help having a finger, Mr. Young. Just like I can’t help not being able to learn numbers and stuff like that. "I said.

The next day, when I got my report card, I tucked it into one of my books. While on the school bus, I opened it : Geography, B⁺ ; Mechanical Drawing, C^- ; English, D^- ; History, C^- ; Gym, B⁺ ; Art, C ; Math, D^-.

That math grade was the most favorite one I ever received. Because I knew that someone in the world finally understood what it was like for me to be missing a finger inside my head.

What grade should the boy hive got in the math test this time（）

A. D^-.

B. B⁺.

C. D.

D. E.

飞机在气温为0℃至-10℃并且存在过冷水滴条件下飞行时形成的结冰通常为：（）.

A.明冰

B.雾凇

C.毛冰

D.霜