关于温度、热量和内能,下列说法正确的是( )
A:物体放出热量,物体的温度一定会下降
B:物体的温度越高,它所含热量就越多
C:两个物体温度相同,它们之间就不能发生热传递
D:﹣5℃物体一定比5℃的物体的内能少
“情绪波动对有些人可以发挥积极作用,那是由于他们在适当时候发泄,在适当时候控制,不使他们泛滥而淹没了别人,也不使他们淤塞使自己崩溃”,罗兰的话启示我们( )①学会调节和控制对人对己都有重要意义 ②要选择恰当的时间和场合控制、宣泄情绪③宣泄情绪不能妨碍他人、损害他人 ④情绪是可以调节和控制的,我们要做情绪的主人
如图所示是某型号的水陆两用坦克,它的车体比普通坦克要大,呈船形,既能在陆地行驶,也能在水中浮动.该水陆两用坦克的总质量是2.2×104kg,每条履带的触地面积是2m2,发动机功率是4.2×105W,水上最大速度14km/h,陆地最大速度54km/h.请根据以上信息求解该坦克:(g=10N/kg)
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 (休斯敦火箭队)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
根据材料内容,选择最佳答案。
化学就是研究物质及其变化.在日常生活中,属于化学学习中常见的物质的是( )