A．The victory over one’s fellow runners.

B．The victory over former winners.

C．The victory of will-power over fatigue.

D．The victory of one’s physical strength.

气雾剂中的氟利昂(如F₁₂)主要用作()。

A．助悬剂

B．防腐剂

C．潜溶剂

D．消泡剂

E．抛射剂