问题 多项选择题

X线经被照体形成X线信息影像,其质量决定于

A.被照体的厚度与密度

B.被照体的原子序数

C.X线的质

D.被照体的形状

E.X线的量

答案

参考答案:A,B,C,E

解析:与被照体形状无关。

阅读理解

阅读理解。

Dear Mom,

     I'm sorry that I can't go back home for Mother's Day next week. On that day, I'll have to go to an

important meeting for my boss, who helps me a lot with my work and life here. But I'll find time to see

you at home soon. 

    Mom, thank you for everything you've done for Tim and me. After Dad died ten years ago, you had to

work in a supermarket in the daytime and in a restaurant at night. But you always gave us two your love and

care. Though you don't have to work now, I still remember your coming home and feeling tired many

evenings.

     Tim is going to finish his studies next month. He said he would move back from school and look for a

job neat home. I'm glad you won't live by yourself anymore. Let's plan to take a trip in the near future. It's

been years since the three of us took a trip together.

    Happy Mother's Day. I love you, Mom.

                                                                                                                                         Best wishes,

                                                                                                                                            John

1. What can we learn about John's mother?

A.  She lives by herself now.

B.  She still works day and night.

C.  She will make a plan to save money.

D.  She used to be too busy to care for her children.

2. What do we know from the letter?

A. John has two brothers.

B. John is unhappy with his boss.

C. John has to work on Mother's Day.

D. Tim will leave home for his job soon.

3. Which is said in the letter?

A.  John's father died at work.

B.  Tim will look for a teaching job.

C.  John bought a gift for his mother.

D.  John hopes to take a trip with his family.

判断题