怎样检验氧化膜的封孔质量？
参考答案：
氧化膜的封孔质量采用磷铬酸侵蚀质量损失法试验，失重不大于30mg/dm2。
读一读，补全对话。
Eric: Hi, Bob. The holiday is coming. What will you do during the holiday?
Bob: Oh, hi Eric. I will go and visit my uncle.
Eric: 1________________________________________________________?
Bob: I will go with my sister.
Eric: 2________________________________________________________?
Bob: We will go next Friday in the afternoon.
Eric: 3________________________________________________________?
Bob: No. We will go by train.
Eric: 4________________________________________________________?
Bob: We will go fishing with my uncle!
Eric: Wow, sounds great!
（）应当承担卫生行政部门下达的公共场所健康危害因素监测任务。
