第五次实验中弹簧测力计的读数如图,为____牛。
1.2
如图所示两个灯泡L1、L2阻值分别为6Ω和10Ω,闭合开关后的现象是( )
妖娆____
忧yù____
莽莽____
笙____箫
骤____然
chà ____开
青荇____
风sāo____
— How do you like the regulations of our school?
— The regulations are strict with the students and they require that students _______ at least 90% of the lectures.
现代生物进化理论认为,生物进化的实质在于( )