马钱子的炮制目的是()
A.揉搓成小团,便于调剂
B.姜炙增强止呕的功效
C.降低毒性,便于粉碎
D.增强润肺止咳
E、增强健脾消积的作用
参考答案:C
L1、L2、L3为三只完全相同的灯泡,按如图所示方式接入一理想变压器。己知匝数比n1:n2=3:1,当a、b接入交流电路时,L2和L3的实际功率为P,此时L1的实际功率P1为___________。
It suddenly to me that this was something that I should never do, so I
turned down her request.
A.happened
B.hit
C.struck
D.occurred