什么是材料消耗量?
参考答案:
是指在正常施工条件下,完成单位合格产品所必须消耗(或摊销)的材料数量。
— Why did you step on my foot?
— I am terribly sorry. I ____ it. [ ]
A. am not noticing
B. didn't notice
C. don't notice
D. haven't noticed
大多数RNA病毒的基因组是( )。
A.dsDNA分子 B.ssDNA分子C.双链RNA分子 D.单链RNA分子