【单选题】The car _____ got four wheels. [ ]
【简答题】用双线桥表示下列反应中得失电子的情况,并指明氧化剂、还原剂、氧化产物、还原产物: 3FeO + 10HNO 3 === 3Fe(NO 3 ) 3 + NO↑ + 5H 2 O ( ) ( ) ( ) ( ) 其中,氧化性:__________ > ___________ ; 还原性:___________ > ___________
【单选题】conversations 1
C.
changed eating habits.
D.
lower production cost.
【单选题】conversations1
A.
The English grammar is quite easy.
B.
It is greatly influenced by French.
C.
It could be pronounced easily.
D.
It is attractive to English beginners.
【简答题】(12分)用双线桥表示下列反应中得失电子的情况,并指明氧化剂、还原剂、氧化产物、还原产物: 3FeO + 10HNO 3 ='== ' 3Fe(NO 3 ) 3 + NO↑ + 5H 2 O ( ) ( ) ( ) ( ) 其中,氧化性:__________ > ___________ ;还原性:___________ > ___________
【单选题】Short conversations 1
A.
They teach compet i t i on as an essential driving skill.
B.
They need more supervision over the high charges and bribes.
C.
They are too few to meet the rising demand.
D.
They have a demand for more competent instructors.
【简答题】(1)写出下列反应的化学方程式:钠在空气中加热______,过氧化钠和水反应______ (2)用双线桥法表示下列氧化还原反应中电子转移的数目,并指出氧化剂.MnO 2 +4HCl(浓) △ . MnCl 2 +2H 2 O+Cl 2 ↑ 氧化剂______.______.