蓄电池点火系中，如点火过迟，可调整点火提前角，应逆着分火头旋转方向转动分电器外壳。
参考答案：对
—The lights in the classroom are still on. Do you know______.
—To revise for the coming exams.
A．what they stay up late for
B．why they stay out late
C．when will they stop studying
D．how they work on their lessons
《中国药典》采用溴酸钾法测定异烟肼，滴定反应中1mol的溴酸钾相当于（）
A.2/3mol
B.3/2mol
C.1/2mol
D.2mol
E.1mol
