（EMB145）什么时候活门组件关闭？（）
A.当检测到下游ACM压气机超温
B.当检测到下游组件活门超压
C.以上都对
参考答案：C
To it we owe the existence of the motor-car, which has replaced the private carriage drawn by the horse. To it we owe the possibility of flying. It has changed the methods of warfare on land and sea. This kind of oil comes out of the earth.
熟料的化学成分和（）之间有一定的规律性。
A.熟料强度
B.水分
C.细度
