①细胞壁 ②细胞膜 ③细胞质 ④液泡膜 ⑤液泡.
设a为最小的正整数,b为最大的负整数,c是绝对值最小的有理数,则a﹣b+c的值为( )
— Yeah, you cannot imagine interesting it is if you don't experience it yourself.
从利用上看,土地资源属于____资源。