0  396621  396629  396635  396639  396645  396647  396651  396657  396659  396665  396671  396675  396677  396681  396687  396689  396695  396699  396701  396705  396707  396711  396713  396715  396716  396717  396719  396720  396721  396723  396725  396729  396731  396735  396737  396741  396747  396749  396755  396759  396761  396765  396771  396777  396779  396785  396789  396791  396797  396801  396807  396815  447090 

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

试题详情

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.

试题详情

23.The flight attendant welcomed us ___ the plane.

    A.abroad       B..aboard      C.board        D.broad

试题详情

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

试题详情

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.

试题详情

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)

试题详情

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。

试题详情

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。

试题详情


同步练习册答案