A:醋酸菌、乳酸菌、毛霉菌丝
B:醋酸菌、毛霉菌、毛霉菌丝
C:醋酸菌、酵母菌、毛霉菌丝
D:酵母菌、醋酸菌、乳酸菌
如图所示电路,下列有关说法正确的是( )
(-4x2)·(3x+1)等于____.
Nobody will help you __________ you help yourself.