A:3υ正(N2)=υ正(H2)
B:υ正(N2)=υ逆(NH3)
C:2υ正(H2)=3υ逆(NH3)
D:υ正(N2)=3υ逆(H2)
He's never rude. I think he's one of the most _______ boys in his class.
地球上某点以东是东半球,以西是西半球,以南是南半球,以北是北半球,则该点的经纬度是( )
图甲为某物理兴趣小组做“探究求合力的方法”实验的装置,其中A为固定橡皮筋的图钉,O为橡皮筋与细绳的结点,OB和OC为细绳,图乙是在白纸上根据实验结果画出的力的矢量图.
invent, coal, discover, journey, king