下面关于二极管结构和应用场合的表述正确的是()
A. 二极管按其制造工艺可分为点接触型、面接触型和平面型三种。
B. 点接触型二极管的结电容小,但允许流过的电流也小,常用于高频小信号的检波。
C. 面接触型允许流过的电流大,但结电容也大,常用于低频大电流的整流。
D. 平面型通常在集成电路中制作,常用作开关。
We often _______ football on the playground
A. play
B. to play
C. are playing
D. will play
He ______for eight hours every day.
A. working
B. to work
C. works
D. worked
Will his parents go to see the Terra Cotta Warriors tomorrow?– No, ________ (不去).A. they willn’t. B. they won’t. C. they aren’t. D. they don’t.
A. they willn’t.
B. they won’t.
C. they aren’t.
D. they don’t.