【单选题】在直流电路中,负载电阻的上功率为P,电压为V,电流为I,则负载电阻值为( )。
【单选题】由三极的内部结构可知,其内部有PN结,它们是( )
【判断题】中国民族理论以中国的民族和民族问题为主要研究对象。
【单选题】由三极的内部结构可知,其内部有PN结,它们是( )
【单选题】If the sky fell down, what______ ?
A.
did you think would happen
B.
do you think would happen
C.
do you think will happen
D.
do you think will have happened
【单选题】对于燃气轮机实际简单循环的比功和效率描述错误的是( )。
【单选题】If the sky fell down, what ____________________?
A.
did you think would happen
B.
do you think would happen
C.
did you think will happen
D.
do you think will have happen