下列流量计中，压力损失最小的是（）.

A.椭圆齿轮流量计

B.双转子流量计

C.刮板流量计

D.涡轮流量计

填空,根据汉语意思完成句子，每空一词。

1.所有这一切发生在周一晚上。  

     _____  _____on Monday night____all this happened.

2.为了提高他自己的说话技能，他训练自己在公共场所讲话。  

     ____ ____ ____improve his own speaking skills, he trained himself in public speaking.

3.你姐姐是怎样的一个人？  

    ____your sister____?

4.在公交车上警察看见一个小偷正在偷别人的手机就匆忙走了过去。  

   The policeman____a thief____someone's mobile phone and hurried to walk near him.

5.昨天他很高兴地去帮助那个老人。  

    He____ ____ ____help the old man yesterday.

6.这个女孩高兴时，不是唱就是跳。  

   When the girl is happy, she____sings____dances．

7.孩子们宁愿出去也不待在家里。 

    Children usually____going out____staying at home.

8.他头发的颜色跟他母亲的一样。   

    His hair is____ ____colour____his mother's.

9.我用功学习，以免考试不及格。  

    I study hard____ ____ I may not fail in the examinations.

10.有必要把这一切都告诉他父亲吗？  

    ____ ____necessary____ ____his father everything?