— ____________ does she go to Hong Kong?
— By plane. [ ]
A. How
B. Where
C. What
答案:A
一条粗细均匀的电阻丝电阻为R,其横截面的直径为d,若将它拉制成直径为110d的均匀细丝,其电阻变为( )
A.110000R
B.10000R
C.1100R
D.100R
老年人在下述哪种情况下不适宜应用洋地黄()
A.阵发性室上性心动过速
B.充血性心力衰竭
C.左心舒张末前后径68mm
D.房颤伴心室率快
E.房室传导阻滞