点火提前角的作用是:使燃气产生的最大压力能在活塞越过上止点后()°时出现。
A、15---20
B、0---5
C、5---10
D、10---15
参考答案:D
The old man was very kind and he some of his money to poor children in
the country .[ ]
A. ran away
B. gave away
C. took away
D. put away
在Ⅱ类精密进近灯光系统中,最大倒闸时间为1s的灯有()。
A.接地带灯
B.跑道边灯
C.滑行道边灯
D.跑道中线灯
E.滑行道中线灯