Daily Quizzes: Many Rewards Await (October 14–October 16)

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1. In surface-type heat exchangers, the parallel flow of the cold fluid and the hot fluid in opposite directions is called ____________. A. Hybrid ； B. Counterflow type ； C. Downstream type. 2. During shaft turning, the lubricating oil pump ____________________. A. It must remain in continuous operation ； B. Can continue to run ； C. It can be stopped from running. 3. The metal with the best electrical conductivity is __________. A. Aluminum ； B. Copper ； C. Silver. Please hide your replies; editing after posting is not valid! Those with different opinions on the provided answer keys can post discussions the next day. For responses from multiple accounts under the same IP, only the first one submitted counts as valid. All three questions are multiple-choice questions; 3 points are awarded for each correct answer, and 10 points – worth either Wealth or Charm – are given for getting all three answers right. There is a reward for everyone who participates. Please hide your answers using the following link: http://bbs.hcbbs.com/thread-492556-1-1.html. Those who provide in-depth explanations and discussions in addition to giving correct answers may receive additional rewards (no extra points will be given if answers are not hidden). Question 1: B; Question 2: A; Question 3: C