在平面直角坐标系中,正方形ABCD的中心坐标为(3,2),其一边AB所在直线的方程为x-y+1=0,则边AB的对边CD所在直线的方程为 。
x-y-3=0
—Learning a language isn't easy. It takes time.
—I agree. (). There's no shortcut.
A. All roads lead to Rome
B. Rome wasn't built in a day
C. Practice makes perfect
D. Slow but sure wins the race
使呼吸道分泌物中酸性黏多糖断裂,唾液酸含量降低,痰液黏度下降的药物是()
A.浙贝母
B.桔梗
C.满山红
D.酸枣仁
E.苦杏仁