题目内容

According to the poster, when walking alone on the street, you should .

A. always take a whistle with you
B. keep your keys in your briefcase
C. avoid wearing headphones
D. put your ID card in your pocket

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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

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【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

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【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

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According to the poster, when walking alone on the street, you should .

A. always take a whistle with you B. keep your keys in your briefcase C. avoid wearing headphones D. put your ID card in your pocket

According to tyhe poster, you should call 911 when .

【单选题】带传动是依靠__________来传递运动和功率的。

【单选题】带张紧的目的是__________。

A. always take a whistle with you
B. keep your keys in your briefcase
C. avoid wearing headphones
D. put your ID card in your pocket