_____ be late again. [ ]
A. Try not to
B. Don’t try to
C. Try don’t to
D. Try not to
答案:A
下列离子方程式中正确的是
A.乙醇和金属钠反应:2CH3CH2OH+2Na →2CH3CH2O-+ Na++H2↑
B.氯乙烷在NaOH醇溶液中加热:CH3CH2Cl + OH-CH3CH2OH+Cl-
C.苯酚与NaOH溶液中和反应:H+ + OH- = H2O
D.苯酚钠溶液中通入少量CO2:
漏出液外观呈()
A.淡黄
B.黄色
C.血性
D.脓性
E.混浊