2010年10月1日,我国成功发射“嫦娥二号”月球探测器,在探测器靠近月球的过程中(探测器质量不变),月球对它的万有引力( )
A:变小
B:变大
C:不变
D:无法确定
移栽植物时常常去掉几片叶片,这样做的目的主要是( )
一个物体做匀速圆周运动,关于其向心加速度的方向,下列说法中正确的是( )
根据材料内容,选择最佳答案。
Name
Personal Information
Fei Junlong
Born in 1965 in Jiangsu, China
An astronaut (宇航员)
Traveled in Shenzhou VI in outer space with Nie Haisheng from October 12th to October 17th, 2005
Yao Ming
Born in 1980 in Shanghai, China
The son of two great basketball players
Joined the Houston Rockets in June, 2002
Jay Chou
Born in 1979 in Taiwan, China
A popular singer
Favorite music: Hip-Hop
Alfred Nobel (1833-1896)
Born in Sweden
A scientist
Known for the Nobel Prizes
Helen Keller (1880-1968)
Not able to see or hear
Worked hard and became one of the famous writers in America
Wrote a lot, such as The Story of My Life