【单选题】Vlad allied himself with foreign countries, and restored the social order destroyed by years of wars.
【单选题】It is said that the math teacher seems towards bright students.
【判断题】配合物的中心离子或原子M和配位体A之间的配位化合,一般是靠着配位体A单方面提供孤对电子与中心离子共用,形成配位键。
【判断题】碗扣式钢管支架接头构造合理,拼装快速、省力,在三维方向上均有可靠的力学强度和自锁性能,避免了螺栓作业和零散扣件的拼装,能方便地组装成各种脚手架和支撑力架等。
【单选题】It is said that math teacher seems ____ towards bright student.(2000.6)
【判断题】氟利昂中的氟是破坏大气臭氧层的罪魁祸首。