下列过程中,主要依靠化学变化实现的是
A:发射火箭
B:水车汲水灌溉
C:太阳能供热
D:风力发电
如图是某电热暖手宝的主要参数.选用水作为吸热或放热物质,是因为水的____较大.已知水的初温15℃(水=4.2×103J/(kg•℃),接通电源正常工作6min时暖手宝处于____状态(选填“通电加热”或“自动断电”)
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