被蜜蜂蜇伤后可用5%~20%的小苏打水湿敷。()
参考答案:对
Medicine and food ________ to the flood areas soon.
A.send
B.was sent
C.will send
D.will be sent
扩散电流的大小与汞柱高度的关系是()。
A.i∝h1/2
B.i21/3
C.iD∝h
D.iD∝h