在调频网目调图像中，（）等因素都会对某一区域的密度产生影响。A、网点的角度 B、每个

弹簧管式压力表在测量稳压时，所测压力不应超过测量上限值的（）

A．1/3

B．1/2

C．2/3

D．3/4

缺乏时可引起“三D”症状的维生素是

A．叶酸

B．烟酸

C．维生素B₁

D．维生素B₂

E．维生素C

按要求写句子。

1. My English teacher is Miss Wang. (对画线部 分提问)

    _____ _____  your English teacher?

2. I usually go to bed at 9:30 every evening. (对画线部分提问)

    _____ _____ you go to bed every evening?

3. This action movie is so boring. (对画线部分提问)

   _____ do you _____ this action movie?

4. My sister is a famous musician. (对画线部分提问)

    _____ _____ your sister?

5. She works for a long time. (改为否定句)

    She _____ _____ for a long time.

Different countries and different people have different manners. We must find out their customs, so that they will not think us ill-mannered. Here are some examples of the things that a well-mannered person does or does not do.

If you visit a Chinese family you should knock at the door first. When the door opens, you’ll not move before the host says “Come in, please!”. After you enter the room, you wouldn’t sit down until the host asks you to take a seat. When a cup of tea is put on a tea-table before you or sent to your hand, you’ll say “Thank you” and receive it with your two hands, not one hand, or they’ll think you are ill-mannered.

Before entering a house in Japan, it is good manners to take off your shoes. In European countries, even though shoes sometimes become very dirty, this is not done. In a Malay (马来西亚的) house, a guest never finishes the food on the table. He leaves a little to show that he has had enough. In England, a guest always finishes a drink or the food to show that he has enjoyed it. This will make the host, especially (尤其) the hostess pleased.

小题1:In China, when the host opens the door, ____ before he says “Come in, please!”

A．you won’t leave

B．you won’t walk

C．you won’t stand in front of him

D．you won’t get in小题2: In European countries,____ when you get into a house.

A．you needn’t take off your shoes

B．you must take off your dirty shoes

C．you are not allowed to wear dirty shoes

D．you should put on clean shoes小题3:In a Malay house, a guest leaves a little food to show that ____.

A．he has enjoyed it

B．he is quite full

C．he is not hungry at all

D．he needs some drink

若施肥不足，后期烟叶脱肥，烟叶生长发育不良，往往有假熟烟或光滑烟叶出现，而且往往产量较低、品质差；若施肥过多（主要是氮素过多），则往往造成烟叶黑暴，组织粗糙