促进有机酸的代谢
参考答案:
钾参与植物体内氮的代谢,木质部运输中钾离子是硝酸根离子的主要陪伴离子。当硝酸根离子被还原为氨后,钾与苹果酸根结合为苹果酸钾,并可重新转移到根部。
在下列各句的空白处填入一个最恰当的单词。
1. I opened the box quickly, but it was _____ .
2. I hadn't taken the keys with me, so I _____ myself out.
3. Don't be nervous! Jump _____ the sand.
4. You can't _____ her. She's much too clever for that.
5. My grandfather is a _____. He has a big farm.
6. Henry didn't _____ until he was over fifty years old.
7. The cartoon Snow White has a happy _____.
8. Children in the USA have a _____ party on Halloween ( 万圣节).
9. All the frightened people_____ from the fire.
10. Can you give me a _____ of paper?
工程造价资料的主要用途有( )。
A.作为编制固定资产投资计划及建设成本分析的参考
B.作为编制投资估算和设计概算的依据
C.作为审查施工图预算的依据
D.作为进行投资贷款和资金筹措的依据
E.作为进行工程结算的依据