在电解质溶液中相接触的零件应选用()对防止腐蚀有利。
A.相同或相近的材料
B.不同材料
C.电极电位差大的材料
D.任意材料
参考答案:A
阅读小天地。
Danny is crying. What's the matter? His key is lost! He can't unlock his door. Then Jenny comes to help
him. They look for (寻找) it on the ground in front of Danny's house, but they can't find it. Where is the key?
They look for it here and there (到处). At last, Jenny finds the key. Do you know where it is? It's in Danny's
pocket (口袋)!
根据短文内容,判断下列句子的正(√)误(×)。
( ) 1. Danny is laughing.
( ) 2. Jenny's key is lost.
( ) 3. Danny can't unlock his suitcase.
( ) 4. At last, Jenny finds the key.
( ) 5. The key is in Danny's pencil case.
教学设计中最先要考虑的问题是 ()
A.教学方法
B.教学内容
C.教学环境
D.教学目标