原油冒出地面时温度约为80℃，然后以超过50℃的温度运送。下图热棒金属支架以上部分为冷凝段，以下部分为蒸发段，当冷凝段温度低于蒸发段温度时，蒸发段液态物质汽化上升，在冷凝段冷却成液态，后又回到蒸发段，循环反复。读图，完成以下问题。

阅读理解
    Mr. and Mrs. Brown have two children， Mike and Liz. The whole family are all busy， so they often leave notes(便条)for each other. Read these four notes of today and answer the following questions.

1）3：30pm  To Mike， Mr. Tyler rang. No football practice today. I'm going to Donna's house to play and be back at 5：00pm. Liz	2）4：00pm   To Liz， It's your turn to walk the dog. I have to do my homework after school. Remember to play with Teddy when you get home! Mike
3）6：45pm Has anyone seen my tennis shoes? I'm in my bedroom doing my homework. Mike	4）9：00pm. I saw your shoes this morning. They smelt terrible so I put them outside the back door. Good night， dears! Mum

第一天图书馆借出了38本书，第二次借出了27本，一共借走了几本书？

在R上定义运算Θ：aΘb=ab+2a+b，则满足xΘ（x﹣2）＞0的实数x的取值范围为（   ）

微创业门槛低,起步易,不需要大笔资金,只要你有创意、点子,就能自主创业，不少地方也出台了相应的扶持政策。在传统就业模式之外，微创业正成为青年就业成长的新模式。微创业热潮涌动,其主要原因是