Nentode
五极管(电子管)
🗣️ 情景例句
I'll doing fine, too.
我也很好。
He that marries for wealth sells his liberty.
为财富而结婚就是出卖自由。
So was born the echo-sounding apparatus, now in general use in ships.
这样就产生了目前各种船舶上普遍应用的回声探测仪。