具有“龙头虎口”性状特征的药材是()
A.蕲蛇
B.乌梢蛇
C.白花蛇
D.眼镜蛇
E.菜花蛇
参考答案:A
—Did you see your sister just now?
—Yes,but she home soon afterwards.
A.goes
B.had gone
C.is going
D.went
如图1所示,并联长管1、2、3,A、B之问的水头损失为()。
A.hfAB=Hf1=hf2=hf3
B.hfAB=hf1+hf2+hf3
C.hfAB=hf1+hf2
D.hfAB=hf2+hf3