To restore the darkened ancient oil painting to its original white color, the method is
A: to scrub by diluted H2O2 solution
B: to scrub by water
C: to paint with TiO2
D: to bleach with SO2
A: to scrub by diluted H2O2 solution
B: to scrub by water
C: to paint with TiO2
D: to bleach with SO2
举一反三
- Painting in oil is harder than（） A: water colours B: in water colours C: paint in water colours D: painting in water colours
- 【单选题】H 2 O 通电 H 2 ↑ + O 2 ↑ A. 2H 2 O 2H 2 ↑ + 1O 2 ↑ B. 2H 2 O 2H 2 ↑ + O 2 C. 4H 2 O 4H 2 ↑ + 2O 2 ↑ D. 2H 2 O 2H 2 ↑ + O 2 ↑
- 对于平面3节点三角形单元，单元尺寸为h，则位移的误差是____量级，应变的误差是____量级，应变能的误差是____量级。 A: $O(h^2)，O(h^2)，O(h^4)$ B: $O(h^2)，O(h)，O(h^2)$ C: $O(h^3)，O(h)，O(h^2)$ D: $O(h^3)，O(h^2)，O(h^4)$
- 酸性焊条的熔渣的成分主要是酸性氧化物，其中包括（）。 A: FeO、SiO<sub>2</sub> B: Fe<sub>2</sub>O<sub>3</sub>、TiO<sub>2</sub> C: SiO<sub>2</sub>、NiO<sub>2</sub>、FeO D: SiO<sub>2</sub>、TiO<sub>2</sub>、Fe<sub>2</sub>O<sub>3</sub>
- 下列分子具有红外活性的是( )。 A: N<sub>2</sub> B: SO<sub>2</sub> C: O<sub>2</sub> D: H<sub>2</sub>