A:多云转阴,气温14℃-28℃,南风4级
B:多云转阴,气温14℃-28℃,北风4级
C:阴转多云,气温14℃-28℃,北风4级
D:晴转多云,气温14℃-28℃,南风4级
The scientist don't exactly know when the universe but they are still studying it.
人类的胚胎在母体内发育的时间大约是
函数 y=sin(x+π2),x∈R 是( )