题目内容

(教材课文原文)
_DIARY OF A SPACE ZUCCHINI _July 1
Today Gardener and his crew will depart in their seed pod; the replacement crew is ready to {A. carry away; B. carry on; C. carry through} in their place. He is wearing his space suit undergarments. Not too stylish but {A. functional; B. nonfunctional; C. conjunctional}. He gave all of us an extra long smell. His nose twitched with the slightest tickle from the leaf hairs on little Zuc. He said that what will be is for the best. It has been a wonderful journey; one chapter is closing, another is {A. to be opened; B. open; C. opening}. He had tears in his eyes, not just a small drop at the corners but a pool that was making him {A. to blink; B. blinking; C. blink}. He reached up and {A. turned up; B. turned out; C. turned down} the light. In the frontier you should not be afraid of the dark.

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某写字楼采用风机盘管加新风的空调方案,空调系统没有加湿功能,为了解决冬季室内过于干燥的问题,租用该写字楼的公司自行在室内设置了超声波加湿器,风机盘管采用两通阀控制,控制器温度值设定在18~C,加湿器开启稳定后室内相对湿度由10%提高到50%,假设房间风机盘管的加热能力足够,这时室内温度、房间热负荷和人体的热舒适感将会________。

A. 室温降低、热负荷增加、感觉变热
B. 室温降低、热负荷减少、感觉变冷
C. 室温基本不变、热负荷增加、感觉变热
D. 室温和热负荷均基本不变、感觉变冷

某办公楼采用风机盘管加新风系统,其中有一普通办公室,共有3个人,人员的散湿量为33g/(h.人),冬季房间围护结构的热负荷为800W,冬季空调室内计算温度为18℃、相对湿度要求为30%,冬季室外空调计算参数为:干球温度一10℃、相对湿度50%,冬季大气压力按1013kPa计算,空气的密度为1.2kg/m3,质量定压热容为1.01kJ/(kg.K),水的平均比热容为4.17U/(kg.K)。室内采用超声波加湿器加湿,该房间冬季空调总热负荷为_______W。

A. 1800~1900
B. 1900~2000
C. 2000~2100
D. 2100~2200

牛乳经均质产生优点包括

现有A、B两个互斥的项目:A项目的净现值为20万元,折现率为10%,年限为4年;B项目的净现值为30万元,折现率为12%,年限为6年。已知:(P/F,10%,4)=0.6830;(P/F,10%,8)=0.4665;(P/F,10%,12)=0.3186;(P/F,12%,6)=0.5066;(P/F,12%,12)=0.2567。在用共同年限法确定两个项目的优劣时,下列说法中正确的有()。

A. 重置A项目的净现值为35.70万元
B. 重置A项目的净现值为42.99万元
C. 重置B项目的净现值为37.70万元
D. B项目优于A项目

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