β is the ratio of _____. A: collector current to emitter current B: base current to collector current C: collector current to base current D: emitter current to collector current

In the common-emitter circuit with a fixed bias, the most often used mothed to regulate the base current is to regulate ( )

The United States is the world’s No.1 emitter of greenhouse gases.

“粒子”特效的属性Emitter能设置粒子的形状

When a BJT is operating in the active region, the voltage drop from the base to the emitter VBE is approximately equal to the____ A: base bias voltage B: base current times the base resistor C: diode drop (about 0.7 V) D: emitter voltage

Which transistor amplifier configuration is the most commonly used? A: common-emitter B: common-collector C: common-base D: None of these are used more often than the others.

黑体能够在所有方向上均匀发射热辐射，黑体属于漫射表面(Diffuse emitter)。

Most New Year's parties have some things( ). A: in common B: in the common C: with common D: on common

Twin brothers usually _______________________. A: have nothing in common B: have nothing in common but the smile C: have a lot of in common D: have a lot in common

黑体能够在所有方向上均匀发射热辐射，黑体属于漫射表面(Diffuse emitter)。 A: 正确 B: 错误