The goods you enquire ______ are out of stock now.
A.by
B.with
C.for
D.in
参考答案:C
伤寒患者在下列何种情况下,应加肾上腺糖皮质激素治疗?
喷油量的控制亦即喷油器喷油开始时间的控制,其目的使发动机燃烧混合气的空燃比符合需要。