4.I __________my teacher carefully,but l __________nothing.
A. listened,listened
B. heard,listened to
C.listened to,heard
D. listened to,listened
第1题:
第2题:
Before using your new pressure cooker, read the following () carefully.
Anotices
Borders
Cadvertisement
Dinstructions
第3题:
考虑EDTA 的酸效应与金属离子的配位效应时,配合物的条件稳定常数的正确描述有
A.lg K'f (MY) = lg Kf (MY)
B.lg K'f (MY) = lg Kf (MY)-lg αY(H)-lg αM(L)
C.酸度越高,其lg K'f (MY) 值越大
D.酸度越高,其lg K'f (MY) 值越小
第4题:
第5题:
当允许误差Et≤±0.1, ΔpM≥0.2, cM=0.01mol/L时,要求
A.lgK’MY ≥5
B.lgK’MY ≥6
C.lgK’MY ≥7
D.lgK’MY ≥ 8