25.As soon as he comes back, I’ll tell him when ________and see him.
A.you will come B.will you come
C.you come D.do you come
24.-----My brother failed in business.
-----_____.
A.I am certain he’ll make it. B.That’s really tough.
C.Everything is going well with me. D.Actually, there is no choice anyway.
23.The flight attendant welcomed us ___ the plane.
A.abroad B..aboard C.board D.broad
22.______, a man who expresses himself effectively is sure to succeed more rapidly than a man whose command of English is poor.
A.Other things being equal B.Other things be equal
C.To be equal to other things D.Other things to be equal
第一节:单项填空(共15小题;每小题1分,满分15分)从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
21.-----Shall we go to the art exhibition right away?
-----_____.
A.It’s your opinion. B.I don’t mind.
C.It’s all up to you. D.That’s your decision.
18.(10分)轻绳一端系在质量为m=30kg的物体A上,另一端系在一个质量为m=2kg套在粗糙竖直杆MN的圆环上.现用水平力F拉住绳子上一点,使物体A从如图所示实线位置O缓慢下降到虚线位置O/,θ=530时,圆环恰好要下滑,求杆与环间动摩擦因数μ.(sin37°=0.6,cos37°=0.8)
17.(10分) 卡车原来以10m/s的速度在平直公路上匀速行驶,因为路口出现红灯,司机从较远的地方开始刹车,使卡车匀减速前进,当车减速到2m/s时,交通灯转为绿灯,司机当即停 止刹车,并且只用了减速过程的一半时间就加速到原来的速度,从刹车开始到恢复原速过程用了12s。
求:(1)减速与加速过程中的加速度大小;
(2)开始刹车后2s末及10s末的瞬时速度。
16.(10分)如图所示,质量为mB=14kg的木板B放在水平地面上,质量为mA=10kg的木箱A放在木板B上。一根轻绳一端拴在木箱上,另一端拴在地面的木桩上,绳绷紧时与水平面的夹角为θ=37°。已知木箱A与木板B之间的动摩擦因数μ1=0.5,木板B与地面之间的动摩擦因数μ2=0.4。重力加速度g取10m/s2。现用水平力F将木板B从木箱A下面匀速抽出,试求:(sin37°=0.6,cos37°=0.8)
(1)绳上张力FT的大小;
(2)拉力F的大小。
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