当b=0时，一次函数y=kx+b就成为y=kx（k为常数，k≠0），叫做正比例函数（function of direct proportion），常数k叫做比例系数（constant of variation）。
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graph of direct proportion function 正比例函数的图象
Buffer function and its unit thickness and loading side side of the pulp mold Su structure unit grow up a direct proportion.
纸浆模塑结构单元的缓冲性能与其单元厚度及承载边边长成正比。
The death rate has positive correlation to the exhaustion of the organic function, and it is in direct proportion to the number of this kind of exhaustion.
病死率与器官功能衰竭显著正相关，且与所并发器官功能衰竭的个数成正比。
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