(1)如果要研究“电磁铁的磁力大小与缠绕着铁芯上的线圈圈数的关系”,你认为李媛媛应选择
(2)如果选择甲和丙两个装置进行实验,实验中相同的条件是
(3)李媛媛拿着一枚小磁针靠近甲装置铁芯下端,结果发现小磁针的N极被吸引,则可推测甲装置中铁芯的上端是
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2