燃油的（）装置有柴油机心脏之称。
A.燃烧室
B.喷油提前角
C.喷射
参考答案：C
.Tony was very unhappy for to the party.
A．having not been invited
B．not having invited
C．having not invited
D．not having been invited
酶活性即酶促反应速度，指在规定条件下单位时间内底物的减少量或以下哪项的生成量（）
A.产物
B.酶
C.辅酶
D.辅助因子
E.激活剂
