ALL-L2骨髓象（） A.小细胞为主，大小较一致 B.小细胞为主，大小不一致 C.

吹奏竖笛时，竖笛内的 ______就会振动而发出声音，按住不同的笛孔，声音的 ______就会改变．

---This is the first time that I have seen you in this neighbourhood!

--- I ________ here only last week.

A．moved

B．move

C．had moved

D．am moving

— Have you finished all your homework?

— Of course. I ________ it before I went out to play football.

A．had finished

B．have finished

C．finished

D．was finishing

根据发生事故危害程度，可将急救援行动分为几个应急救援级别？

在同一温度下，烷烃和汽油的焓值分别（）芳香烃和润滑油

A.高于和低于

B.均高于

C.低于和高于

D.均低于