胶轮车行驶时,如驱动力和行驶阻力相等,汽车处于()状态。
A、加速行驶
B、等速行驶
C、减速行驶
D、停止行驶
参考答案:B
Which of the following is not considered a cost of nonconformance to quality
A.Scra
B.Rewor
C.Expeditin
D.Process contro
闪蒸气的主要成分是()
A、CH4
B、H2S
C、CO2
D、H2O