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【单选题】
PH从7.4降到7.0时,FⅦa的活性变化
【单选题】
健康人的皮肤偏酸性,其正常pH值为()
【单选题】
大多数真菌生长所需要的最适pH值是()。
【单选题】
1. 阿司匹林的pKa是3.5,它在pH为7.5肠液中,按解离情况计,可吸收约:
【判断题】
若溶液是胶体或有颜色就不能用pH计测定溶液的pH值。
【单选题】
血浆pH值主要取决于()
①
KHCO<sub>3</sub> /H<sub>2</sub> CO<sub>3</sub> 缓冲对
②
K<sub>2</sub> HPO<sub>3</sub> /KH<sub>2</sub> PO<sub>3</sub> 缓冲对
③
NaHCO<sub>3</sub> /H<sub>2</sub> CO<sub>3</sub> 缓冲对
【单选题】
You________return the book now. You can keep it till next week if you like.
【单选题】
Thispencilis______ thanthatone.
【单选题】
Lets clean our classroom,________?
【单选题】
My uncle_______to see me. He’ll be here soon.
【单选题】
He________accomplish the task in time.
【单选题】
If you learned a bit about calligraphy, the ?art of writing Chinese characters, you would realize there ______ a lot of ?pleasure in it.
【单选题】
Whenwearrived,wefoundthemeetingroomcrowdedwith______students.
【单选题】
She_______ the door before she goes away.
【单选题】
—We all had a lot of fun at the barbecue ?yesterday. Pity you weren’t there.
—I really should have gone with ?you but I _______ on some remaining problems.
【单选题】
When he was a boy,he used to go there and watch________.
②
bicycles to be repaired
③
bicycles being repaired