A.北京冬奥会上,礼仪服饰采用高科技石墨烯发热材料,石墨烯属于有机高分子材料 |
B.航天服壳体使用的铝合金材料熔点比纯铝高 |
C.乙酸钠过饱和溶液结晶形成温热“冰球”,该过程吸收热量 |
D.“海斗号”号潜水器外壳材料为钛合金,22号钛元素在周期表中位于d区 |
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