关于磁石的用法哪项是正确的
A．入汤剂宜先煎
B．潜阳安神宜生用
C．纳气定喘宜醋淬
D．A+B
E．A+B+C
参考答案：E
—What’s the matter with Paul?
—A letter from his parents in New Jersey _________ as attack of homesickness.
A．set out
B．set about
C．set up
D．sent off
液体和气体都没有粘性。
