A.70-80 B.60-70 C.50-60
A.加成反應(yīng) B.中和反應(yīng) C.置換反應(yīng)
A.15℃ B.20℃ C.25℃ D.30℃
A.70-75% B.70-80% C.75-80% D.93-95%
A.10--20℃ B.35--45℃ C.50--60℃