搜题请搜索小程序“爱下问搜题”
问题 单项选择题

试管凝集法检测军团菌时，凝集结果的判定，“++++”现象为（）。

A.上清完全透明，菌体于管底呈伞状沉淀

B.上清几乎完全透明，管底有伞状沉淀

C.上清稍透明，管底有伞状沉淀

D.液体有勉强的透明度，管底有稍微沉淀

E.液体均匀浑浊，管底无沉淀

答案

参考答案：A

阅读理解
阅读理解。

      It's Monday today. The young couple (夫妻) are at work and their children are at school but their
parents are retired at home.
      "It's your birthday today, dear." Mrs. Morison says."Let's go shopping and make a birthday dinner
at home." The old man agrees with her. So they go out. But it's very cold outside. Most shops are closed
and they can' t buy any vegetables or meat. When they walk by a small restaurant, Mr. Morison says,
"Well, then, Let's go in and eat something there."
      The old woman thinks he's right and they come in. There's nobody but a girl.
      "Can I help you?" asks the girl.
      "A fish, four eggs and some chicken and bread," says Mrs. Morison. 
       Half an hour later, the girl brings all their dishes to them and Mrs. Morison says, "Your birthday,
dear…" She asks her husband to eat first and she watches him.
       The girl comes over and feels strange (奇怪的) and asks, "Aren't you hungry, madam?" "Yes, I am
hungry," says the old woman. "But I have to wait. He's using my false teeth (假牙) now."

1. Mr. and Mrs. Morison are at home because            .
[ ]
A. It's Monday today
B. It's very cold today
C. They have some housework to do
D. They are old and don't go to work
2. Mr. and Mrs. Morison go shopping            .
[ ]
A. to have dinner in the restaurant
B. to make a birthday dinner at home
C. to cook lunch for their children
D. to wait for their friends
3. The word "but" in "There's nobody but a girl." means in             Chinese.
[ ]
A. 除了
B. 但是
C. 仅仅
D. 然而
4. The old woman asks her husband to eat first because            .
[ ]
A. he leaves his money at home
B. she's afraid of (害怕) him
C. it's his birthday today
D. she isn't hungry
5. The old woman waits for            .
[ ]
A. better dishes
B. some dishes
C. her false teeth
D. her children
查看答案
填空题

油压减振器的作用是使机械能经节流作用产生（），来消耗振动能量
查看答案