2018-04-28 15:37 小马过河
The answer to this question is C. The key lies in remembering the ideal gas law: PV = nRT.
According to this formula, an increase in temperature is accompanied by an increase in pressure. A is wrong, since the average kinetic energy of gas molecules corresponds to their temperature: if the temperature increases, so does the average kinetic energy of the molecules. B is wrong because we’re dealing with a closed container: the mass cannot either increase or decrease. D is wrong because a gas must be cooled, not heated, to change phase into a liquid. Finally, E is wrong because the specific heat of any substance is a coonstant, and not subject to change. We’ll touch on all this and more in Chapter 9: Thermal Physics.
1. The author's primary purpose is to
A. demonstrate a display of learned eloquence
B. encourage pupils to study diligently
C. discuss the proper means to education
D. distinguish the more serious from the less dignified motives for study
E. dissuade students from applying their learning to unethical pursuits
2. By "expert men" (line 5) the author most nearly means
A. persons with competence in specific activities, but who lack general education
B. persons who have mastered a craft or trade
C. persons who carry out the decisions of others
D. persons who have devoted themselves to their studies
E. persons who conduct the concrete business of the day
3. The author compares "abilities" and "plants" (line 14) to make the point that