When you find the engine is hotter than normal, you should ______.

A．drive to a service station to get a cool engine

B．turn off your heater so as to cool down the engine

C．switch on the heater as soon as possible

D．try to make the engine boil over ______.

化学在生产和日常生活中有着重要的应用。下列叙述正确的是

A．汽车尾气中含有氮的氧化物，是汽油不完全燃烧造成的

B．“辽宁舰”上用于舰载机降落拦阻索的特种钢缆，属于新型无机非金属材料

C．白酒中混有少量塑化剂，少量饮用对人体无害，可以用过滤的方法除去

D．高纯度的二氧化硅用于制作光导纤维，光导纤维遇强碱溶液会“断路”