下列属于细胞分化、癌变和衰老的共同表现的是[ ]
A.细胞形态、结构和功能上发生变化
B.新陈代谢速度减慢
C.遗传物质和细胞功能发生改变
D.细胞膜的通透性降低
答案:A
---- Is there any particular soup you would like to have?
---- _____ you select is all right with me.[ ]
A. Whatever
B. Anything
C. No matter what
D. Whichever
过热器系统在哪些部位布置有疏水门?