从10里面减去6个一，还剩4个一。[ ]

阅读理解。

Dear Sam,

     Thank you for your email.

     I'm visiting (参观) Beijing with my mother and my sister Kate now. My father John and my brother

  David don't come with us. They are in New York. My father is a doctor at a hospital and he doesn't have

  time. My brother is a middle school student and he has to study his lessons. There are many people in

 China. They are very nice and l speak Chinese with them. I like the food in China,too. Dumplings (饺子)

 are my favourite food. I like noodles and pork, too. I also take many photos. Do you want to have a

 look?

                                                                                                                                Henry

1. Who is in China now?

    A. Sam

    B. David

    C. Henry

    D. John

2. Why doesn't Henry's father go to China?

    A. He hasn't got any time.

    B. He doesn't like China.

    C. He has to study his lessons.

    D. He can't speak Chinese.

3. What doesn't Henry do in China?

    A. Take photos.

    B. Eat dumplings.

    C. Speak Chinese.

    D. Have a party.

4. How many children have Henry's parents got?

    A. One

    B. Two.

    C. Three.

    D. Four.

5. Which of the following is TRUE?

    A. Kate has got two brothers.

    B. John works at a school.

    C. Henry can't speak Chinese.

    D. Sam is Henry's brother.

X线主防护是指（）

A.对散射线的防护

B.对漏射线照射的防护

C.对非电离辐射照射的防护

D.对原发射线照射的防护

E.对病人的防护

下列关于现行出租电路资费标准的说法，错误的是（）。

A.模拟中继线月租费每月100元，用于放开经营电信业务的数字中继线每月3000元

B.音频电路按距离远近分为本地网营业区内和本地网营业区间2个档次

C.数字数据电路、数字电路资费除按上述距离分档外，还根据速率的不同分为多个级次

D.音频电路按距离远近分为本地网营业区内、本地网营业区间和长途3个档次

关于银行汇票“保证”的规定，正确的是( )。

A．保证人可以由汇票债务人以外的任何人担当
B．保证人在汇票上未记载保证日期的，保证无效
C．保证人在保证时附有保证条件的，不影响对汇票的保证责任
D．保证人为二人以上的，保证人之间不承担连带责任

溢流阀中的螺母松动，弹簧变形，滑阀配合过紧等故障，会引起其在运行过程中产生振动。