A:①③
B:①④
C:③④
D:②③
During holidays,Kitty usually goes to see the exhibits in many museums,such as the history museum,the art museum,the museum of science and technology and the museum of natural history.There are thousands of wonderful things in museum.There are paintings,sculptures(雕塑),costumes(服饰),swords(剑),ancient animal bones and plants,stuffed animals(动物标本)and many others.It is always a good review of history to visit those museums.It is also a great way to learn more things by myself.
如图所示,一辆汽车在平直公路上,车上有一木箱,试判断下列情况中,木箱所受摩擦力的方向.
(1)汽车由静止加速运动时(木箱和车面无相对滑动);
(2)汽车刹车时(二者无相对滑动);
(3)汽车匀速运动时(二者无相对滑动);
(4)汽车刹车,木箱在车上向前滑动时;
(5)汽车在匀速行驶中突然加速,木箱在车上滑动时.
事实
推测
A
12Mg与水反应缓慢,20Ca与水反应较快
56Ba(IIA族)与水反应更快
B
Si是半导体材料,同族Ge也是半导体材料
Ⅳ族的元素都是半导体材料,
C
HCl在1500℃时分解,HI在230℃时分解
HBr的分解温度介于二者之间
D
Si与H2高温时反应,S与H2加热能反应
P与H2在高温时能反应