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举一反三
【多选题】如图甲,小球与轻质细杆连接后绕固定点O在竖直平面内做圆周运动,小球经过最低点时的速度大小为v,此时轻杆的拉力大小为F,拉力F与速度的平方 的关系如图所示,图象中的数据a、b及重力加速度g均为已知量,以下说法正确的是( )
A.
数据a与小球的质量无关
B.
数据b与小球的质量无关
C.
只与小球的质量有关，与圆周轨道半径无关
D.
利用数据a、b和g能够求出小球的质量和圆周轨道半径
【单选题】——Did you see Lucy last night ?She must have left home as she was wondering round the town at midnight . ——The fact that she was wondering round the town at midnight she had left home for good .
A.
was not meaning
B.
does not mean
C.
was not mean
D.
would not mean
【单选题】3She stared at the painting, wondering where she it.
A.
saw
B.
has seen
C.
sees
D.
had seen
【简答题】质量均为10kg的两个质点A和B的初速度均为零，质点A受到一常力F1=20（N）作用，质点B受到一大小为F2=4t（N），而方向不变的力作用，则在10秒末质点A的速度的大小vA=______m/s；质点B的速度的大小vB=_______m/s。
【单选题】She stared into the overwhelming darkness, wondering if he was as aware of her presence as ______.
A.
she was of his
B.
she was of him
C.
she did of him
D.
she did of his
【单选题】_____herself wondering whether she had made a mistake, she felt embarrassed and at a loss.
A.
Catching
B.
Caught
C.
Being caught
D.
Having been caught
【简答题】质点加速度 a 的大小与所受合力 F 的大小成( ),与质点的质量成( )。
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