Engineering College;
Northeast Agricultural University;
Harbin 150030;
China;
Heshan Farm;
Jiusan Sub-bureau of the General Bureau of State Farms of Heilongjiang Province;
Nenjiang 161443;
Heilongjiang;
China;
大功率拖拉机; 播种; 驾驶员; 驾驶疲劳; 心率; 劳动强度;