我国的交通习惯是将自行车道与汽车道放在同一断面上通量大于()辆/天时,应设置专门的自行车道。
A.1000
B.2000
C.2200
D.3000
参考答案:C
— Do you know Mr Black _____ by the police?
— Yes. He's believed to have killed a woman. [ ]
A. wants
B. is wanted
C. is wanting
D. has wanted
加热KClO3和MnO2的混合物,其反应前后发生了变化的是[ ]
A.元素的种类
B.MnO2的质量
C.氧原子的个数
D.氯元素的化合价