把各数填入它所属的集合内：15，-19，-5，215，0，-5.32，2.•3．

下列哪些是粘附分子在炎症发生中的作用（）

A.帮助白细胞在血管壁上的附壁滚动和激活

B.使白细胞与血管壁紧密粘附

C.使白细胞沿血管壁移行

D.使血小板在血管壁上的附壁滚动和激活

E.使血小板沿血管壁移行

Government reports, legal papers and most business letters are the main situations ____ English is used.  [ ]

A. when  

B. that  

C. how  

D. where

非储备外汇减少就意味着国内需求增加，非储备外汇增加就意味着国内需求减少。( )

Passage 1

According to the local copper in the south London neighborhood of Battersea: a. the people there did not have significant improvement in their housing condition b. the people need to be more open-minded c. the people need to be more civilized d. the people need to have wider access to education

二次压榨脱水是压缩空气进入（）之间，使隔膜产生弹性挤压滤饼。

A、滤板和滤板

B、滤板和滤布

C、滤板和隔膜

D、滤布和隔膜