【单选题】下列描述没有错误的是( )
A.
选择合适的催化剂,可以使水在较高温度下分解,产生氢气,并释放出热量
B.
能源、材料、信息被称为现代社会发展的三大支柱
D.
燃料电池是通过可燃物在氧气中燃烧,把部分化学能转化为电能的一种装置
【单选题】I saw Mary ____ the house.
A.
open the door and go into
B.
to open the door and to go into
C.
open the door and to go into
D.
open the door and went into
【单选题】根据下列信息判断氢气燃烧生成水时的热量变化,其中一定正确的是( )
A.
H 2 O分解为H 2 与O 2 时放出热量
B.
生成1mol H 2 O时吸收热量245kJ
C.
甲、乙、丙中物质所具有的总能量大小关系为乙>甲>丙
【单选题】—_____ the door, please. —Come in. The door _____ . [ ]
【简答题】A.Please open the door. B.Don't open the door. C.She is not sure whether to open the door. D.She doesn't agree.
【单选题】---- _______the door, please. ----Come in please. The door _______.
【简答题】rubber [ ˈrʌbə ] n. 橡胶;橡皮 [ pl.] 胶鞋 a. 橡胶的