填料是填料塔的核心,下列填料中不属于实体填料的是()。
A.拉西环
B.鲍尔环
C.鞍形网
D.波纹板
参考答案:C
Don’t say any more; we all believe the facts than your words. What you have explained doesn’t make _____.
A.sense
B.fun
C.use
D.meaning
田间校验一般设置()个处理。
A.5
B.4
C.3
D.2