【单选题】There will be an important English lecture at 14:30 this Sunday afternoon. (就划线部分提问)
A.
When will there be an important English lecture this Sunday afternoon?
B.
What time will there be an important English lecture this Sunday afternoon?
C.
What time is there an important English lecture this Sunday afternoon?
【判断题】KH2PO4水溶液的质子条件为:[H+]+[H3PO4] = [H2PO4-] + [HPO42-] + 2[PO43-] + [OH-]
【单选题】There will be an important English lecture at 14:30 this Sunday afternoon. (就划线部分提问)
A.
When will there be an important English lecture this Sunday afternoon?
B.
What time will there be an important English lecture this Sunday afternoon?
C.
What time is there an important English lecture this Sunday afternoon?
【单选题】林 ( lín ) 娜 ( nà ) 的 ( de ) 自行车 ( zìxíngchē ) 钥 ( yào ) 匙 ( shi ) 在 ( zài ) 哪儿 ( nǎer ) ?
A.
书 ( shū ) 包 ( bāo ) 里 ( lǐ
B.
衣服 ( yīfu ) 口 ( kǒu ) 袋 ( dài ) 里 ( lǐ
C.
桌子 ( zhuōzǐ ) 上 ( shàng
D.
在 ( zài ) 自行车 ( zìxíngchē ) 上 ( shàng
【简答题】计算0.1mol.L-1K2HPO4、KH2PO4、K3PO4溶液的pH。 (2)计算KH2PO4和等体积、等物质的量K。PO。混合液的pH。
【单选题】HPO 4 2- 的共轭碱是 -------( ) (A) H 2 PO 4- (B) H 3 PO 4 (C)PO 4 3- (D) OH -