问题
填空题
由于摩擦带传动具有弹性且依靠()来传动,所以工作时存在弹性滑动,不能适用于要求传动比恒定的场合。
答案
参考答案:摩擦力
由于摩擦带传动具有弹性且依靠()来传动,所以工作时存在弹性滑动,不能适用于要求传动比恒定的场合。
参考答案:摩擦力
从方框中选择正确选项完成对话,其中有两项是多余的。
Ben: Yes, madam. What would you like to drink, Tony? Tony: I’d like some tea. Ben:小题2: Tony:Iced tea ,please,小题3: Ben: I’d like some lemonade(柠檬).小题4: Tony:Yes, I’d like a pizza, please. Woman: What would you like on it ,sir? Tony: Mushrooms(蘑菇) ,green peppers(青椒) and onions,please. Ben:All right.小题5: Woman: Yes. Ben: We want a cup of iced tea, a glass of milk, a glass of lemonade ,a pizza and two eggs, please. Woman: OK. |