【单选题】阅读理解,请选择正确的答案。 There are over three million known compounds, with no end(没有尽头) in sight as to the number that can and will be prepared(制备,准备) in the future. Each compound is unique(唯一的) and has ch...
A.
Water is liquid, but can be changed into solid and gas under cetain conditions.
B.
Water is composed of one atom of hydrogen and one atom of oxygen per molecule.
C.
Water could react with sodium or lime, but could not react with sulfur trioxide.
D.
No other compound has exact physical and chemical properties expect water and mercuric oxide.
【简答题】translate • Matter can be changed into energy, and energy into matter. • Air pressure decreases with altitude. • Avoid using the computer in extreme cold, heat, dust or humidity. • According to scient...
【简答题】Translation A complementary metal—oxide semiconductor (CMOS) chip provides flexibility and expandability for a computer system. It contains essential information that is required every time the comput...