He keeps a record of everything he had seen there.
A:he
B:that
C:which
D:what
①章炳麟 ②邹容 ③陈天华 ④梁启超
如图所示,一个有弹性的金属环被一根橡皮绳吊于通电直导线的下方,当通电直导线中的电流I增大时,圆环的面积S和橡皮绳的长度L将( )
下列选项中属于生物的是( )