哪些措施可以减小斥汽损失？（）
A.采用扭叶片；
B.减少喷嘴组数；
C.在叶轮上开孔；
D.在动叶非工作弧段加装护罩。
参考答案：B
启动发动机，拉紧手制动，挂上低速挡，慢慢抬高离合器踏板，徐徐加大油门起步，车体不动，发动机并不熄火，说明离合器（）。
A、发抖
B、分离不彻底
C、正常
D、打滑
The place was flooded ________ it had been raining for several weeks.[ ]
A. because
B. because of
C. ever since
D. as a result of
