转向机件磨损严重、前轮定位不准、车架变形等会引起转向盘发抖、摆振、行驶不稳。
参考答案:对
The naughty boy _____ to me that the hen _____ there just now had ____ two eggs the
day before.
A.laid; laid; laid
B.laid; lay; lain
C.lied; laid; lain
D.lied; lying; laid
饱和蒸气被污染的主要原因是()和()两个原因造成。