| 1. | We take the downward direction as positive .
我取向下的方向为正。 |
| 2. | The college jumped him from instructor to full professor .
大学突然把他从讲师提升为正教授。 |
| 3. | One can show that the discriminant of the numerator is positive .
人们可以证明分子的判别式为正。 |
| 4. | Tensile member forces in pinjointed frames are designated positive .
枢接构架中，拉力构件的力规定为正。 |
| 5. | Recall that the angles are positive if the ray has a positive slope .
记住，若光线之斜率为正则角度为正。 |
| 6. | Transverse forces acting in the positive co-ordinate direction are positive .
横力作用在正坐标方向的为正。 |
| 7. | the highest permissible temperature in the cavity for charging is ＋50℃.
装药时药室中允许的最高温度为正50度。 |
| 8. | The conventional tail must be at a negative angle of attack, and the canard tail at a positive angle .
通常的尾翼必须处于负迎角，而鸭式尾翼则为正迎角。 |
| 9. | Margin values can be either positive or negative
边距值可以为正，也可以为负。 |
| 10. | If the stride is positive , the bitmap is top - down
如果跨距为正，则位图自顶向下。 |
