浮环密封是一种液体节流式非接触密封,通过()使浮环克服自重而与轴或轴套保持一定的间隙,避免固体间的直接接触。
参考答案:油楔作用
如果x与2互为相反数,那么|x-1|等于( )
A.1
B.-2
C.3
D.-3
Please help yourself to the seafood.()
A.Thanks, but I don't like the seafood
B.Sorry, I can't help
C.Well, fish don't suit for
D.No, I can't