下列有关细胞核的叙述中,错误的是[ ]
A.细胞核是新陈代谢的主要场所
B.细胞核是细胞遗传和代谢的控制中心
C.细胞核是遗传物质储存和复制的场所
D.细胞核具有双层膜的结构
答案:A
.
Some companies have introduced flexible working time with less emphasis on pressure ____.
A.than more on efficiency
B.and more efficiency
C.and more on efficiency
D.than efficiency
船体分段吊运时,可根据分段()决定是否设临时加强。