下列疾病在传染过程中表现为“显性感染”多的是（）
A.乙型脑炎
B.麻型疹炎
C.白型喉炎
D.流型脑炎
E.脊髓灰质炎
参考答案：B
“All hope was not lost.” means “__________.”
A．There was no hope at all
B．Hope was everywhere
C．No hope was lost
D．Not all hope was lost
A．U=vBl，流过固定电阻R的感应电流由b到d
B．U=vBl，流过固定电阻R的感应电流由d到b
C．U=vBl，流过固定电阻R的感应电流由b到d
D．U=vBl，流过固定电阻R的感应电流由d到b
vBl
vBl