Bonnie looks very smart and is always ________ pink because pink is her favorite color.
A:with
B:on
C:about
D:in
将记录仪的两个电极分别放置在神经纤维膜外的a、c两点,c点所在部位的膜已被损伤。其余部位均正常。下图是刺激前后记录仪指针的偏转情况。下列有关叙述不正确的是( )
东北地区降水的变化规律是( )