汽化器式发动机进气过程是指（）充填汽缸的过程.
A.外界空气
B.增压器引入空气
C.新鲜混合气
D.雾化燃油
参考答案：C
Beijing is big city and it’s capital of China.
A．the, the
B．a, a
C．the, a
D．a, the
