A study on proportional mortality ratio of cancer and some other chronic diseases among workers in 20 asphalt felt-making factories is reported.
对全国20个油毡厂工人的癌症和其它几种慢性病进行了比例死亡比的研究。
In order to study the evaporation of ethanol-gasoline, experimental investigations had been carried out to determine the saturated stream pressure of some low proportional ethanol -gasoline blends.
为了解乙醇汽油的蒸发性，文中运用雷德法对几种低比例的乙醇汽油进行了饱和蒸汽压特性试验研究。
The theoretical study shows that static unbalance of the rotor was proportional to displacement of the rotor ; the larger displacement scale coefficient, the higher measuring accuracy.
理论研究表明：转子的静不平衡量与转子的偏移成正比；位移比例系数越大，测量精度越高。
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