【简答题】如图,直线AB与O相切于点B,过点O的直线交O于点C,D。在O上取一点E,连结BE和DE,BE与直径CD的交点为F。已知∠A=30°,AB= (1)求O的半径; (2)求∠E的度数; (3)求阴影部分的面积。(结果保留三个有效数字)
【简答题】质量为1kg的物体,在外力作用下由静止开始运动了3m,外力作功为18J,则物体的末速率为 m/s。
【单选题】lau gh enou gh ph oto ph one
【简答题】According to interpersonal theory of depression, people might be mentally ill without enough______.
【单选题】如图 1 ,已知直线 AB 与 CD 相交于点 O , EO ⊥ CD ,垂足为点 O ,则图中 ∠ AOE 和 ∠ DOB 的关系是 ( )
【判断题】CFR Ex Ship’s Hold Rotterdam 是指卖方必须把货运到鹿特丹,在舱底交货。
【单选题】It remains ________ whether Jim’ll be fit enou
A.
18. It remains ________ whether Jim’ll be fit enoughto play in the finals. (浙江) A.seen
【单选题】When she was over fifty, the late nineth century mother ______.
A.
would be healthy enough to take up paid employment
B.
was usually expected to die fairly soon
C.
would expect to work until she died
D.
was unlikely to find a job even if she wanted one
【单选题】产蛋鸡日粮中钙磷比例一般为( ):1。(1.0分) A 1~2 B 3~4 C 5~6 D 7~8
【简答题】如图所示,质量为m=1kg的物体,放在倾角θ=37°的足够长固定斜面底端上,现对物体施加一个大小为F=16N、方向平行斜面向上的外力,使物体由静止开始在力F的作用下,从斜面底端向上运动t 1 =1s后撤去外力F。已知物体与斜面间的动摩擦因数μ=0.25,不计空气阻力,物体可视为质点,sin37°=0.6,cos37°=0.8,取g=10m/s 2 。求: (1) 物体由静止开始在力F的作用下开始向...