当口腔唾液pH为5时,应选用的漱口液是
A.2%硼酸溶液
B.2%碳酸氢钠溶液
C.0.02%呋喃西林溶液
D.3%过氧化氢溶液
E.0.1%醋酸溶液
参考答案:B,D
It is a rule in his family that ______ comes home earlier should cook the dinner for the family.
A.Anybody
B.who
C.who that
D.whoever
排烟风管的隔热层应采用厚度不小于()的不燃绝热材料。
A.20mm
B.40mm
C.50mm
D.60mm