1)height of sighting line,视线高度2)rectified altitude,视高度视高度3)elevation of sight,视线高程4)elevation of line of sight,视线标高5)Height of line sight,视线高6)high apparent density,高视密度
用法和例句
Preparation of elementary chemical manganese dioxide with high apparent density by direct oxidizing manganese hydrolyzate with air;
