通过电力电子开关器件将交流电转换为直流电的电路称为()电路。
参考答案:整流
Nanjing isn't so large_____Shanghai,however,it's the second_____city in East China.[ ]
A. like; largest
B. as; largest
C. like;large
D. as;large
甲型病毒性肝炎是由()
A.空气飞沫传播
B.水、食物传播
C.虫媒传播
D.血清或血液制品传播
E.土壤传播