问题
选择题
—How did you like the lecture tonight? —Very________.I doubt if I will come to this kind of lecture next time. |
[ ] |
A. encouraging B. encouraged C. disappointing D. disappointed |
答案
答案:C
—How did you like the lecture tonight? —Very________.I doubt if I will come to this kind of lecture next time. |
[ ] |
A. encouraging B. encouraged C. disappointing D. disappointed |
答案:C
常温下,有下列四种溶液:
① | ② | ③ | ④ |
0.1mol/L NH3·H2O溶液 | pH=11 NaOH溶液 | pH=1 H2SO4溶液 | pH=3 CH3COOH溶液 |
下列说法正确的是( )
A.①与③等体积混合,溶液pH<7
B.②与④等体积混合,溶液pH>7
C.将VmL④的溶液浓缩到10—2VmL后,pH与③相同
D.②与③混合,若溶液pH=7,则V(NaOH) : V(H2SO4) =100 : 1