特殊用法antenna extender1.天线延长器chain extender1.增链剂lead extender1.助抗爆剂(与铅抗爆剂同时用)oil extender1.油填充剂plasticizer extender1.增塑增容剂reagent extender1.活性增量剂wire life extender1.铜网寿命延长剂zoom extender1.可变焦距扩展镜
