Be(OH)2 和Al(OH)3均具有两性。
A. 对
B. 错
激光是工作物质受光或电刺激,经过反复发射反射传播放大而形成的强度大、方向集中的光束。
A. 对
B. 错
要努力提高全民族的思想道德素质和科学文化素质。Efforts must be made to upgrade the ideological and ethical __________ of the entire people, and improve their cultural and scientific __________.
A. standards...levels
B. levels...standards
马克思主义是我们立党立国的根本指导思想。Marxism is the fundamental guiding principle for the __________ of the Party and the __________ of the country.
A. development…consolidation
B. consolidation…development