截止收益率

常用调整货件的平衡方法有哪两种？

将50g质量分数为ω₁，物质的量浓度为C₁的浓硫酸沿玻璃棒加入到VmL水中，稀释后得到质量分数为ω₂，物质的量浓度为C₂的稀溶液。下列说法中正确的是

A．若ω₁=2ω₂，则C₁<2C₂，V=50mL

B．若C₁=2C₂，则ω₁<2ω₂，V>50mL

C．若C₁=2C₂，则ω₁<2ω₂，V<50mL

D．若ω₁=2ω₂，则C₁>2C₂，V<50ml

_______ no buses , we have to walk home．

A．There were

B．There being

C．It was

D．It being

塑性变形