问题
单项选择题
（）卡瓦悬挂器是利用套管的悬挂重量，激发悬挂器下部的密封件（主密封）来达到套管和套管头之间的密封。
A、W型
B、WE型
C、WD型
D、D型
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
（）卡瓦悬挂器是利用套管的悬挂重量，激发悬挂器下部的密封件（主密封）来达到套管和套管头之间的密封。
A、W型
B、WE型
C、WD型
D、D型
参考答案：A
Frank worked for the Canadian government. One day, he was小题1:to learn more about wolves (狼). Do wolves kill lots of caribou (北美驯鹿)? Do they kill people?They gave him lots of food, clothes and guns (手枪). Then they put him on a plane and took him to小题2:.The plane put him down and went away. There were no houses or people in this place. But there were lots of animals and lots of wolves.People tell 小题3:stories about wolves. They say wolves like to kill and eat people. Frank remembered these stories, and he was afraid. He had his gun with him 小题4:. Then one day, he saw a group of wolves. There was a mother wolf with four baby wolves. A father wolf and another young wolf lived with them.Frank 小题5: these wolves every day. The mother was a very good mother. She gave milk to her babies. She gave them lessons about life. They learned 小题6: get food. The father wolf got food for the mother. The young wolf 小题7:the children. They were a nice, happy family—a wolf family! Frank did not need his 小题8:any longer. In a short time, he got on well with the family. Frank watched them for five months. He learned that many stories about the wolves were 小题9:.Wolves do not eat people, and they do not eat many large animals. And he also learned bad things about men. It was men who killed many caribou and wolves. Later, Frank wrote a book about wolves. He wanted people to 小题10:them and not to kill them.
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