Let me .[ ]
A. have a try
B. has a try
C. want a try
答案:A
下列四个命题中.正确的有
①若a>b,则a+1>b+ 1;
②若a>b,则a-1>b-1;
③若a>b,则-2a<-2b;
④若a>b,则 2a<2b. [ ]
A.1个
B.2个
C.3个
D.4个
一般药物一煎沸后应再煎( )
A.5~10min B.15min C.20min D.25min E.30min