A:180°
B:360°
C:1800°
D:无法计算
方程x+10.3−2x-10.7=1可变形为( )
We will _______ pass the exam if we study hard.
______name is Li lei.
将标有“6V 3W”和“6V 2W”的甲、乙两只小灯泡串联起来,接在电压为6V的电源两端,接通电路后,以下说法正确的是( )
保护生物多样性最有效的措施是( )