慢性阻塞性肺病患者慎用（）。 A.利尿剂（袢利尿药） B.非二氢吡啶类钙通道阻滞剂

根据短文内容及首字母提示完成短文。（每空一词）

Friends play an important part in our lives. We may have many friends, but we often don’t understand c   71  how we make friends. We may get on well with a n   72   of people, but we usually make friends with a very few of them.

People use the word "friend" freely. Friends may k   73 each other since childhood or they may recently meet. In fact, people many have different k   74  of friends such as school friends, work friends, or sports friends. A person may c   75   different friends for different activities. If you play with s   76  on the playground, the person is your playmate. If you often play chess w   77  a friend, the person is your chess partner.

One may have many good friends and only one best friend. " Best friends" or "close friends" are u   78  two people who have known each other for a long time. A close friend is someone who is able to s   79  experience, joys and sorrows(悲伤) with you. This is a person you can rely on (信赖) when you are in n   80  , and this is the person to whom you are willing to lend a helping hand.

Friendship is one of life’s greatest treasure.

（）可对道床进行抛砟、配砟、整形和清扫轨面工作。

A.枕底清筛机

B.捣固车

C.配砟整形车

D.动力稳定车

以下程序的功能是：将值为三位正整数的变量X中的数值按照个位、十位、百位的顺序拆分并输出。请填空
#include＜stdio.h＞
main()
int x=256；
printf("%d-%d-%d\n"，______，x/10%10，x/100)；

压力容器气密性试验压力（）设计压力。

A、等于

B、大于

C、小于

D、大于或等于