远红外加热干燥与电力热烘比较，它的优点是
A．省时
B．省电
C．脱水率高
D．干燥快
E．较高的杀菌、杀虫及灭卵能力
参考答案：A,B,C,D,E
Scientists are convinced________the positive effect of laughter_______physical and mental health. [ ]
A. of；at
B. by；in
C. of；on
D. on；at
可最终灭菌产品C+A用的洁净服是否需要灭菌？（FL1）
