A.“天宫二号”空间站的太阳能电池帆板,其主要材料为晶体硅 |
B.“长征七号”采用液氧、煤油等作为推进剂,液氧、煤油是纯净物 |
C.C919大飞机上使用了芳纶纤维,芳纶属于天然纤维 |
D.杭州亚运会上的礼仪服饰用丝绸作为面料,丝绸属于糖类 |
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