通常用石灰与水的反应速度，即石灰的水活性来表示石灰的活性度，_爱下问搜题

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问题判断题

通常用石灰与水的反应速度，即石灰的水活性来表示石灰的活性度，石灰的活性度与石灰的熔化速度、成渣速度成正比。

答案

参考答案：对

完形填空

When responding to any adult, you must answer by saying “Yes ma’am” or “No, sir.” Just nodding your head is not acceptable.
Because I grew up in rural North Carolina, this rule comes 36 to me, and it seems the obvious choice to come first. If you want children to respect you, you have to let them know 37 . Simply telling them you want them to address you by saying “sir” lets them know 38 you expect them to treat you. I also tell my students it’s a very useful tool when 39 with adults, and furthermore it also 40 handy for any adult interacting with another adult. Case in point: I was 41 the phone recently with the phone company discussing the inaccuracies(差错) of my 42 . The lady I spoke to was not 43 and seemed annoyed. 44 , in the midst of the conversation, I threw in a “yes, ma’am,” and her entire 45 changed. She became far more helpful and 46 to deal with, and she 47 cutting my bill in half.
Some of my students in Harlem were to be 48 for a chance to attend a high-rated junior high school. The school only had thirty openings for the following year, and twelve of my students were 49 the many kids across the city who applied for the spots. I practiced what the interview would be 50 with my students, and one main thing I stressed was, “ 51 you say ‘yes ma’am’ or ‘no sir’ no matter what!” Weeks after the interviews, I was delighted to hear that all twelve of my students had been 52 . When I talked with the admissions director at the school, the main 53 he made over and over was how 54 my students were in their interviews. It seemed like just such a simple thing to do, but it gets 55 .

A．disagreeing

A．interesting

D．interviewed

B．By no means

C．Make a promise

D．Be cautious

C．appreciated

A．contribution

A．considerate

B．responsibility

填空题

凡存在能量、有害物质或能量、有害物质失控，都有可能导致事故的发生，都是产生风险的根源，即（）。