柴油机几何压缩比的数学表达式是（）。
A: VS/Vc
B: 1+VS/Vc
C: VS/Vc-1
D: 1-VS/Vc
A: VS/Vc
B: 1+VS/Vc
C: VS/Vc-1
D: 1-VS/Vc
举一反三
- 在下列压缩比的表达式中，错误的是: ε＝1+Vs/Vc|ε＝Va/Vc|ε＝Vc/Va|ε＝（Vs＋Vc）/Vc
- 设计巡航速度用符号（）表示。 A: Vs B: VA C: VC D: VB
- 在VS或者VC环境中录入程序代码，需要先新建一个________文件。(填3个汉字)
- 83.在下列压缩比 ε 的表达式中错误的是（）。[式中 Vc 为余隙容积，Vs 为气缸工作容积，Va 为气缸总容积]
- 【单选题】In the short transmission line model, the relative size of the sending end voltage Vs and the receiving end voltage Vr depends on the load power factor. Which of the following is correct? Power factor = 0.8 (leading) Power factor = 1 Power factor = 0.8 (lagging) A Vs > Vr Vs < Vr Vs < Vr B Vs < Vr Vs = Vr Vs < Vr C Vs < Vr Vs = Vr Vs > Vr D Vs > Vr Vs > Vr Vs > Vr A. See item A in the problem B. See item B in the problem C. See item C in the problem D. See item D in the problem