A:f(x)=﹣x+1
B:f(x)=x2﹣1
C:f(x)=2x
D:f(x)=ln(﹣x)
在光学显微镜下不易看清的细胞结构是细胞膜.(判断对错)
of us has to have our temperature taken when we get in school every morning.