—If it ______ rain tomorrow, but actually the weather forecast has removed our worry.
A:could
B:would
C:might
D:Should
A=2×3×7,B=2×5×3,那么A和B的最大公因数是( )
若,则( )
设A、B、C为三角形的三内角,且方程(sinB﹣sinA)x2+(sinA﹣sinC)x+(sinC﹣sinB)=0有等根,那么角B( )