第6题: [单项选择]It is a new-type double-sided piping with corrosion protection and pressure ______. A. insistence B. persistence C. resistance D. reservoir 参考答案:C 答案解析:[考点] 名词词义辨析。解析resistance n.反抗,抵抗,阻力,电阻,耐……力;insistence n.坚持,不容拒绝;persistence n.坚持不懈,执意,持续,存留;reservo