题目

“Whose turn is it _____ now?” asked the doctor. A . examined B . to examine C . being examined D . to be examined 答案：B下列说法正确的是（）A. 均一稳定的液体一定是溶液B. 检测酒驾的重铬酸钾（K2Cr2O7）中铬元素的化合价为+7价C. 硫在氧气中燃烧产生明亮的蓝紫色火焰D. 厨房发生燃气泄漏应马上开灯检查