机械工业目前发达国家机械工业占工业总产值的比重,除苏联(1980年)为28.7%外,一般都在33%上下,而我国1983年仅为23.4%.主要原因是:生产技术落后,国内重大建设项目的设备自给率低;机器更新缓慢;产品出口量小.建材工业 1952—1983年,我国建材工业年平均增长速度为10.8%,高于整个工业9.8%的速度.但同国外比,还较落后.目前我国城镇居民人均住房面积达不到5平方 Machinery Industry At present, the share of machinery industry in the total industrial output value in developed countries is generally 33% except for 28.7% in the Soviet Union (1980), compared to 23.4% in China in 1983. The main reasons are: backward production technology, domestic In the period from 1952 to 1983, the average annual growth rate of China’s building materials industry was 10.8%, higher than the 9.8% of the whole industry, but with the exception of foreign countries, But also laggard.At present, the per capita housing area of ​​urban residents in China is less than 5 square feet