金属元素M的常见化合价有+4和+6,其与氮、氧元素组成的化合物MO 2 (NO 3 ) 2 受热可发生的分解反应为:MO 2 (NO 3 ) 2 →M x O y + NO 2 ↑+ O 2 ↑ 在600K 时,将气体产物收集于试管中并倒扣于水中,气体全部被吸收、水充满试管。则生成的M的氧化物的化学式是 [ ]
【判断题】Yesterday Mr. Burke announced there'd be a unit test and anyone who didn't pass would have to come to school on Saturday. This is a complex sentence.
【简答题】I cheated on a unit test in math class this morning during second period with Mr. Burke. Afterward, I was too sick to eat lunch just thinking about it. I came straight home from school, went to my roo...