题目

With his mother him, he is getting on well with his work. A. helpB. to helpC. helpingD. helps 答案：C 解析: 略下列实验或制法中不涉及化学变化的是（ ）A．用食醋除水垢B．用葡萄酿制葡萄酒C．用酒精杀菌消毒D．工业上分离液态空气制氧气