正确处理旅游企业和旅游者之间利益关系的一项准则是()。
A.不卑不亢、光明磊落
B.热情友好、宾客至上
C.真诚公道、信誉第一
D.遵纪守法、廉洁奉公
参考答案:C
Modern English _______ from about the middle of the 16th century .[ ]
A. came into being
B. was put to use
C. was put into practice
D. turned into reality
简述晶闸管获得导通的条件。