电感线圈对高频电流所呈现（）很大，而对（）则可视为短路。
参考答案：感抗；直流
We have read for an hour. Now let's stop ____a rest. [ ]
A. had
B. have
C. to have
D. having
下列遗传系谱图中，不可能为红绿色盲病的是（）
A.A
B.B
C.C
D.D
or an hour. Now let's stop ____a rest. [ ]