目前常采用（）、（）、（）检测供油正时。
参考答案：经验法；闪光法；缸压法
Only when I left my parents for Italy how much I loved them. [ ]
A. I realized
B. I had realized
C. had I realized
D. did I realize
以下哪项不是急性一氧化碳中毒的临床表现（）
A.昏迷
B.口唇黏膜呈樱桃红色
C.抽搐
D.呼吸困难
E.贫血
