下列各组物质中,不属于同系物的是 ( )
A.CH2=CH2与CH2=CH—CH=CH2
B.CH≡与CH3—CH2—C≡CH
C.CH3OH与CH3CH2OH
D.
答案:A
______ has an internal clock that regulates the beating of our hearts, and the ______ of our breathing.
A.Mankind; step
B.Human; pace
C.Human being; step
D.Man; pace
中华人民共和国第446号国务院令一共有多少条?