295B电铲推压抱闸摩擦片数是（）个。

短文改错。

     Good morning, everyone,

     It's great honor for me to speak here. My name's Li Xiaojun, born of a harmonious family. My father

and mother are all high school teachers. Influenced by them, I read widely during my early age, but I've

developed a great interest in arts and sports. I'm easy-going, get along well with my classmates.

     It is this personality which helps me win over all my classmates' friendships, and also help me overcome many difficulties both in academic and personal life. Being admitted in your university has always been a

beautiful dream for me. I dream constantly that I, along with mine classmates, will study happy with the

help of the respectable professors; I dream that I will swim freely in the sea, enjoying the waves of

knowledge.

     I hope all my dreams will come true in the near future.

     Thank you.

对变更效果的评估是变更管理中非常重要的一环。（）不属于变更效果评估的内容。

A.项目基准是评估依据

B.是否达到了变更提出时的要求

C.在干系人间就变更达成共识

D.评估变更的效率和效果

Which of the following statements about initial margin requirements in the U.S. is FALSE（）

A. If the stock price decreases, the investor’ s relative margin will decline. 

B. Currently, the initial margin requirement is 60 percent. 

C. The Federal Reserve Board specifies the minimum margin requirements.

简述牙源性成釉细胞瘤的影像学表现。

为什么降压变压器的低压绕组在里边，而高压绕组在外边？