米泔样便主要见于阿米巴性痢疾。()
参考答案：错
Mr. Smith is talking ______ the children ______ their art festival. [ ]
A. to; with
B. about; to
C. with; about
D. with; to
晶闸管中频电源的调试，首先应对（）进行通电检查。
A.电源时序
B.继电控制电路
C.整流触发电路
D.主电路整流
