电容滤波整流电路,当负载电阻RL开路时,电容端电压达2U2N(U2N为变压器二次绕组电压有效值)。()
参考答案:对
I usually have an egg and two _____ of milk for breakfast. [ ]
A. bottle
B. a bottle
C. bottles
D. the bottles
若工件的等分数是63.用万用分度头分度时应采用()
A.简单分度法
B.角度分度法
C.差动分度法