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
①H3O+ ②[B（OH）4]- ③CH3COO- ④NH3 ⑤CH4．
A．①②
B．①③
C．④⑤
D．②④
— __________ will the bridge be finished?
—In a few months. [ ]
A. How soon
B. How long
C. How often
D. How far
