未知题型 Animals have a natural ________ for survival.A extinctionB distinctionC institutionD instinct
未知题型 ________ fame and fortune, she was basically an unhappy woman.A In case ofB In consequence ofC In spite ofD In care of
单项选择题 浓度为 0.1mol/L 的下列酸,能用 NaOH 溶液直接准确滴定的是() 。A.HCOOH(pKa=3.45)B.H3BO3(pKa=9.22)C.NH4NO3(pKb=4.74)D.H2O2(pKa=12)