在一次用天平和量筒测盐水密度的实验中，老师让同学们设计测量方案，其中小星和小王分别设计出下列方案：

方案A：（1）用调节好的天平测量出空烧杯的质量m₁；

（2）向烧杯中倒入一些牛奶，测出它们的总质量m₂，则这些牛奶质量为______；

（3）再将烧杯中的牛奶倒入量筒中，测出牛奶的体积V₁；

（4）计算出牛奶的密度ρ．

方案B：（1）用调节好的天平测出空烧杯的总质量m₁；

（2）将牛奶倒入量筒中，记录量筒中牛奶的体积V；

（3）将量筒内的牛奶倒入烧杯测出它们的总质量m₂；

（4）计算出牛奶的密度ρ=______．（用m₁、m₂、V表示）

通过分析交流上述两种方案后，你认为在方案A中，牛奶的______（选填“质量”或“体积”）测量误差较大，导致牛奶密度的测量值比真实值偏______（选填“大”或“小”）．

在方案B中，牛奶的______（选填“质量”或“体积”）测量误差较大，牛奶密度的测量值与真实值相比______（选填“大”或“相等”或“小”）．

We had guests last night who have not stayed in a B&B hotel ago. They did not want breakfast because that they were going out early in the morning. They came back lately and had some tea. I came into the living room and saw one of them just go through the kitchen door but turn on the light. He was looking for a glass the cupboard. He had no ideas that the kitchen was not for guests. I just smiled to me and thought, "What can I do We are guests after all. \

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