灭菌法所用的物理方法有高温、紫外线、电离辐射等,而以紫外线的应用最为普遍。()
参考答案:错
()是多效蒸发器末效塔釜物料的主要分析项目。
A、铁含量
B、灰分
C、醛含量
D、乙二醇含量
. They got married in 2001 and three years later they ________ their child.
A.have
B.had
C.had had
D.will have