餐饮单位杀灭虫害的方式,通常应首选()。
A.器械
B.杀虫剂
C.灭鼠药
D.毒饵
参考答案:A
I sooner but I didn’t know that they were waiting for me.
A.had come
B.was coming
C.would come
D.would have come
细胞外液中主要的阳离子是
A.Na+
B.Fe2+
C.Ca+
D.K+
E.Mg2+