—What a surprise it is you've climbed up Mount Tai!
—I didn't believe I could do it _______ I got to the top.
A:unless
B:after
C:until
D:as
下列说法正确的有( )
(1)若ac=bc,则a=b;
(2)若ac=b-c,则a=﹣b;
(3)若x2=y2,则﹣4ax2=﹣4by2;
(4)若方程2x+5a=11﹣x与6x+3a=22的解相同,则a的值为0.
三大改造的完成在我国探索社会主义道路过程中最突出的意义在于( )
本初子午线是指( )