发动机起动时,拉动阻风门至适当位置,使阻风门下方形成较大的真空度,汽油将从主喷管、怠速喷口和()吸出。
A.加浓口
B.过渡喷口
C.怠速空气量孔
参考答案:B
He has no place to live in because his house has been ________.[ ]
A.built on the ground
B.burnt to the ground
C.built in the ground
D.burnt on the ground
空速值越大,则气体与催化剂的接触时间越()。
A.长
B.短
C.无变化
D.无法判断