A:CH≡CH+H2O →△H2SO4 CH3CHO
B:C2H5Br+H2O →△NaOH C2H5OH+HBr
C:CaC2+2H2O→Ca(OH)2+C2H2↑
D:CH3COOCH3+H2O →△催化剂 CH3COOH+CH3OH
如图,直线c与直线a、b相交,且a∥b,则下列结论:①∠1=∠2;②∠1=∠3;③∠3=∠2中,正确的个数为( )
补全数列35,30,25,20,____,10,……