问题
单项选择题
万向联轴器主要用在()。
A、两轴成直线场合
B、两轴无相对位移场合
C、两轴有较大偏斜角场合
D、转速较高场合
答案
参考答案:C
万向联轴器主要用在()。
A、两轴成直线场合
B、两轴无相对位移场合
C、两轴有较大偏斜角场合
D、转速较高场合
参考答案:C
“低碳生活,从我做起!”请仔细阅读下列材料,找出以下五种”低碳”行为产生的直接效应.
小题2: Daphne always turns off the lights as soon as she leaves her office. 小题3: Mr. White sometimes goes to work by bus instead of driving his car. 小题4: Li Lei uses QQ or e-mail to communicate with his friends instead of paper letters. 小题5: Miss Zhang never wears fur(皮草) clothes and she decides to eat less meat. |