Production Technology [Question of the Day] Monday, 2011.08.29
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This post was last edited by *nyang3390 on 2011-8-30 08:04. Multiple-choice question: 1. Based on their working principle, safety valves can be classified as (). A. Spring-type, slightly-open type, open type B. Slightly-open type, moderately-open type, fully-open type C. Closed type, semi-closed type, open type D. Spring-type, weight-type, lever-type, guided type. 2. The purpose for which heat exchangers often need to be cleaned is to improve (). A. Heat transfer area B. Heat transfer temperature difference C. Heat transfer coefficient D. Changing the heat transfer method Note: 1. Please hide your reply; for instructions, see: http://bbs.hcbbs.com/thread-492556-1-1.html. 1 p1 E. Z0 }* a" D% x* {4 g 2. Do not edit after replying. 3. There must be a reward for participants. 1、D 2、C
Reply 1# sun-rock D B
Reply 1# sun-rock c c
Reply 1# sun-rock 1、D 2、C
Reply 1# sun-rock 1D 2C