【多选题】本周的一道作业题(4-18),欲在一个套管式换热器中用冷却水将某溶液冷却,给定了两种流体的进、出口温度以及溶液的流量,还给了总传热系数。求冷却水流量及逆、并流时的所需换热管长度。本题中,逆流与并流时在如下哪些方面是相同的()
【单选题】健达“奇趣蛋”是意大利巧克力制造商费列罗集团旗下的产品2007年在中国上市销售,其广告主题紧密结合目标人群特点,主要抓住少年儿童的
【单选题】The walls look solid, but in fact they ’ re _______.
【单选题】Personal space of Russians is ( ) .
D.
they have no idea of personal space
【多选题】Why is personal space shrinking in general?
A.
Personal space is psychological, not physical.It has less to do with the space outside us than with our inner space
B.
It is directly proportional to the expansion of self-absorption: people whose attention is inward do not bother to look outward.
【简答题】The walls look solid, but in fact they're .
【单选题】在一套管式换热器中,用冷却水使某气体温度降低。如将冷却水的流量提高,则()
B.
总传热系数不会获得明显提高,传热速率可能获得明显提高
C.
总传热系数可能获得明显提高,传热速率不会获得明显提高
【单选题】以下哪一种运算电路反相端“虚地”( )。
【单选题】Which is the closest area of personal space?
【单选题】The walls look solid, but in fact they’re________.