轨道的钢轨类型选择：运行7吨矿车的轨道应采用不低于（）千克/米_爱下问搜题

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问题单项选择题

轨道的钢轨类型选择：运行7吨矿车的轨道应采用不低于（）千克/米的钢轨。

A、11

B、24

C、30

D、42

答案

参考答案：C

单项选择题

下列疾病出现肺泡呼吸音减弱并呼气期延长，除外

A．慢性支气管炎

B．支气管哮喘

C．甲状腺功能亢进

D．慢性阻塞性肺气肿

E．支气管狭窄

完形填空

A boy selling magazines walked up to a house people seldom visited. The house was old and the owner   36  came out. When he did come out he wouldn’t say hello to anybody   37  simply stared at them.
The boy knocked on the door and   38 . As he was ready to   39  away, the door slowly opened. “What do you want?” the old man said.
“Uh, sir, I’m selling these magazines and I was   40  if you’d like to buy one.” The old man   41  stared at the boy. The boy could see the inside of the house and   42  some dog figurines（小雕像）. “Do you   43  dogs?” the boy asked. “Yes, I do. They’re my family here and they’re all I have.” The boy felt sorry for the man, as he seemed to be very   44 . “I’ve a magazine here for collectors. It’s perfect for you. I also have one about dogs since you like dogs so much.” But the old man said, “I need   45  of the magazines, now goodbye.”
The boy was sad. He went home and then an idea   46  to him. He had a little dog figurine. He walked back to the old man’s house with the   47 . He knocked on the door again and this time the old man came right to the door. “Boy, I             48   I told you no magazines.”
“No, sir. I know that. I wanted to bring you a   49 . ” The boy handed him the figurine and the old man’s face   50 . “It’s a Golden Retriever. I have one at home. This one is   51  you.” The old man was   52 ; no one had ever shown him so much   53 . “Boy, you have a kind   54 . Thank you!” From that day on the old man 55 coming out of the house and talking with people.

C．disappointed