为防止焊接过程中合金元素的烧损,应在电焊条的药皮中加入的成分有( )。
A.氧化剂
B.还原剂
C.酸性氧化物
D.碱性氧化物
参考答案:B
阅读短文,将文后各句补充完整。
John is five years old and he is a lovely boy. His mother likes him very much.
One day, John asks his mother for two cents.
"What do you do with your money?" his mother asks.
"I give it to a poor old woman." John answers.
"Oh, my dear, you are a good boy." says his mother, "Why do you give your money to the poor old
woman?"
"Because she sells me the candies." John says.
1. John's mother likes him because he is a boy.
2. John gives his money to an old .
3. The old woman gives John some .
若遍身肿,烦渴,小便赤涩,大便闭。此属()
A.风水
B.皮水
C.阳水
D.阴水