在倾斜巷道内,启动车辆行车时,应()。 A.先挂档后松手闸 B.先松手闸后挂档 C. 发布时间:2018-04-07 05:18 │ 来源:www.tikuol.com 题型:单项选择题 问题: 在倾斜巷道内,启动车辆行车时,应()。A.先挂档后松手闸B.先松手闸后挂档C.直接踩油门D.A和B都行
题型:单项选择题 It was John’s quick action and knowledge of first aid that saved Ms Slades’s life. He immediately asked __1__ for bandages, but when nobody could __2__, his father got some tea towels and tape from their house. John used these to treat __3__ to Ms Slade’s hands. He slowed the bleeding by __4__ until the police and __5__ arrived. 查看答案
题型:单项选择题 如图所示,A、B是两只相同的齿轮,A被固定不能转动。若B齿轮绕A齿轮运动半周,到达图中C的位置,则齿轮上所标出的的箭头所指的方向是( )A.竖直向上 B.竖直向下 C.水平向左 D.水平向右 查看答案
题型:单项选择题 如图所示,AB是一质量为m的均匀细直杆,A端靠在光滑的竖直墙壁上,B端置于水平地面上,杆身与竖直方向夹角为θ,杆与地面的摩擦系数为μ,保持平衡,则此时杆与地面的摩擦力为( )A.mgtgθB.mgsinθC.μmgD.μmg 查看答案