1.选择题- (共2题)
2.向心力演示器如图所示。转动手柄1,可使变速塔轮2和3以及长槽4和短槽5随之匀速转动。皮带分别套在塔轮2和3上的不同圆盘上,可使两个槽内的小球分别以几种不同的角速度做匀速圆周运动。小球做圆周运动的向心力由横臂6的挡板对小球的压力提供,球对挡板的反作用力,通过横臂的杠杆使弹簧测力套筒7下降,从而露出标尺8,标尺8上露出的红白相间等分格子的多少可以显示出两个球所受向心力的大小。现分别将小球放在两边的槽内,为探究小球受到的向心力大小与角速度的关系,下列做法正确的是( )

2.单项选择- (共7题)
3.
Although metals ________widely in qualities such as strength and hardness,they all have certain qualities in________.
A.vary;general | B.differ;common |
C.react;particular | D.refer;detail |
4.
There was plenty of time. She ________ .
A.mustn't have hurried | B.couldn't have hurried | C.must not hurry | D.needn't have hurried |
5.
He managed to make himself _____ at the meeting yesterday.
A.understanding | B.to understood |
C.understood | D.to be understood. |
6.
Compared with the price of that store,the price of this one sounds________—all the goods are good value.
A.considerable | B.reasonable |
C.available | D.sensible |
8.
Though________up in a big city,Bill always prefers to live a country life.
A.brought | B.was brought |
C.bringing | D.having brought |
试卷分析
-
【1】题量占比
选择题:(2道)
单项选择:(7道)
-
【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:1
5星难题:0
6星难题:5
7星难题:0
8星难题:1
9星难题:0