This was but an additional testimony of the superiority of the socialist economic system over the capitalist economic system.

A．proof

B．witness

C．evidence

D．validity

各喷油泵齿条实际拉出刻线差别太大时，会引起柴油机（）。

A.冒蓝烟

B.排气温度过高

C.增压器喘振

D.飞车