测量序号 | Bx/μT | By/μT | Bz/μT |
1 | 0 | 21 | - 45 |
2 | 0 | - 20 | - 46 |
3 | 21 | 0 | - 45 |
4 | - 21 | 0 | - 45 |
A.测量地点位于南半球 |
B.当地的地磁场大小约为50μT |
C.第2次测量时y轴正向指向南方 |
D.第3次测量时y轴正向指向东方 |
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