哪种添加剂会明显提高电解质的导电度()。
A、氟化锂
B、氟化镁
C、氟化钙
D、氟化铝
参考答案:A
Wash your hands with soap ____ the experiment so as to keep in good health. [ ]
A. in the end of
B. at the end of
C. to the end of
D. by the end of
不是急性咽炎病因的是()
A.全身及局部抵抗力下降
B.溶血性链球菌感染
C.肺炎双球菌
D.烟酒过度等理化因素刺激
E.流行性感冒杆菌及病毒