就归经而言,下列哪种说法是正确的
A.归经是药物作用的趋向性B.归经是药物作用酌定位概念C.归经是药物对脏腑的作用D.归经是药物对经络的作用
参考答案:B
-Jack,I haven’t seen your brother for a long time.
-He ___________ Shanghai on business for two months.[ ]
A. went to
B. has gone to
C. has been in
D. has been to
泡沫塑料具有()的作用。
A.减振
B.吸声
C.隔热
D.防火