题目内容

在做恒压过滤常数的测定实验的过程中,要把连着压力罐的尾阀稍微开一点,为什么?

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当操作压强增加一倍,K值是否也增加一倍?要得到同样的过滤液,过滤时间是否缩短一半?

影响过滤速率的主要因素有哪些?

Listening Comprehension－Directions: Choose the best answer to complete each of the following sentences according to the information contained in the listening passage.Where did the woman see the three old men?

A. In front of her store.
B. In her front yard.
C. In her dream.
D. In her doorway.

Who were the three old men respectively?

A. Success, Hope and Wealth.
B. Faith, Hope, and Love.
C. Wealth, Faith and Success.
D. Love, Success and Wealth.