题目内容

According to tyhe poster, you should call 911 when .

A. you have lost something important
B. you have seen a suspicious activity
C. you have difficulty finding your way home
D. you have seen any burned-out streetlights

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SEEKPurpose:- to help people live more fulfilling and productive working lives- to helpe organisations 1Founders: Paul and Andrew Bassat and Matthew RockmanWebsite: www.seek.com.au, was launched in 2Contribution: connecting 3 to relevant job opportunitiesJob boards: having exposure to 4 billion people and relationshiops with over 8900,000 hirers and 4 candidatesEducation businesses:- to help working adults achieve their 5- to provide independent education and career insights

【单选题】带传动是依靠__________来传递运动和功率的。

A. 带与带轮接触面之间的正压力
B. 带与带轮接触面之间的摩擦力
C. 带的紧边拉力
D. 带的松边拉力

【单选题】带张紧的目的是__________。

A. 减轻带的弹性滑动
B. 提高带的寿命
C. 改变带的运动方向
D. 使带具有一定的初拉力

【单选题】与链传动相比较,带传动的优点是__________。

A. 工作平稳,基本无噪声
B. 承载能力大
C. 传动效率高
D. 使用寿命长