通过构建一个基于向下倾斜劳动供给曲线的就业决定模型，解析出一种称之为“支出约束引致型失业”的新类型。
The thesis constructs an employment decision model based on a downward-sloping labor supply curve, and parses a type employment called by the author as "expenditure-constraint-causing unemployment".
PV g型适用于20度以下倾角的潮湿有水物料输送。
PVG type suitable for the wet Angle of 20 degrees below water conveyance.
PVC 型适用于16 度以下倾角的干燥条件下物料输送。
PVC-type applies to 16 degree angle of the drying conditions, the following material handling.
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