人体神经调节与体液调节的区别在于神经调节（）
A.作用慢而持久
B.作用快，持续时间短
C.作用快而广泛
D.作用慢，持续时间短
参考答案：B
下列化合物分子中，在核磁共振氢谱图中能给出二种信号的是
A．CH3CH3
B．CH3COOCH3
C．CH3COCH2CH3
D．CH3OCH3
The author implies that most small children believe that the quantity of water changes when it is transferred to a container of a different ______. a. color b. quality c. weight d. shape
