The ship was ____ (lock) in the ice during the whole winter.
如图为人体细胞与内环境之间的物质交换示意图,请据图完成下列问题.
下列诗词中,能反映近代中国社会生活风尚的是
已知a>b>c,求证:1a-b+1b-c≥4a-c