—Do you have bags? —No, I don't. But I have six _____.
A:box
B:boxes
C:boxs
某同学要了解本班同学的近视发病率.现有两种方案:
方案一:抽样调查法,任抽班上3组同学进行调查;
方案二:普查法,对全班同学进行调查.
由图可知,蛙卵孵化的最适温度是( )
I ate a hamburger this morning.
若b= a-3+3-a+2,求ba的值.