A:1-mn+3n≤12m
B:1-mn+3n≥12m
C:1-mn+3n<12m
D:1-mn+3n>12m
— Which kind of program do you like better, science fictions or comedies?
— I prefer ______ comedies.
关于抗生素的叙述,下列哪项不正确( )
如图所示,物体A和B的重力分别为10N和3N,不计弹簧秤和细线的重力和一切摩擦,则弹簧秤的读数为( )