A.聚四氟乙烯具有耐热、耐酸碱腐蚀等优异性能,可由四氟乙烯经缩聚反应制备 |
B.聚乳酸具有良好的生物相容性和生物可吸收性,可由乳酸单体通过缩聚反应制备 |
C.脲醛树脂具有绝缘性能好、耐磨性极佳等优异性能,可由尿素和甲醛缩聚而成 |
D.聚碳酸酯()具有透光性好等优异性能,其一种单体可以为碳酸二甲酯 |
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