恒摩尔流假定不满足以下的条件是()。A.各组分的摩尔气化潜热相等 B.气液接触时,因

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问题:

恒摩尔流假定不满足以下的条件是()。

A.各组分的摩尔气化潜热相等

B.气液接触时,因温度不同而交换的显热可忽略

C.塔设备保温良好,热损失可忽略

D.每层板下降的液体摩尔流都是相近的

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I got a job teaching special education at a school in Coachella, California, a desert town about 170 miles from home. It was no (1) job. Street gangs (2) around the school after dark.

"Be careful, " Dad warned me during one of my frequent weekend (3) home. He was concerned about my living (4) , but I needed to be on my own.

One evening, I stayed after school to rearrange my classroom. (5) , I turned out the light and closed the door. Then I (6) toward the gate. It was (7) ! I looked around. Everyone had gone home.

After (8) all the exits, I found just enough (9) to squeeze under a gate in the back of the school. Then I walked toward my car, parked in a field behind the building.Suddenly I heard voices. I (10) around and saw at least eight boys following me. (11) my pace, I reached into my shoulder bag to get my key. I (12) all over the inside of my handbag. But the key wasn’t (13) ! Dear Lord, please help me, I prayed (14) . Suddenly, my fingers touched a loose key in my purse. I didn’t even know if it was for my car, but I took it out and (15) it. It worked!I opened the door, slid in and locked it—just (16) the teenagers surrounded the car. Trembling , I started the engine and (17) away. When I returned to my apartment, the phone was ringing. It was my Dad. I didn’t tell him about my experience; I didn’t want to (18) him. "Oh, I forgot to tell you!" He said, "I had a (n) (19) car key made and slipped it into your purse—just (20) you ever need it. \

6().

A.headed 

B.rushed 

C.looked 

D.wandered

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按照《中华人民共和国环境保护法》第二十条规定:各级人民政府应当加强对农业环境的保护,防治土壤污染、土地沙化、盐渍化、贫瘠化、沼泽化、地面沉降和防治植被破坏、水土流失、水源枯竭、种源灭绝以及其他生态失调现象的发生和发展,( )。

A.推广植物病虫害的综合防治

B.合理使用化肥

C.合理使用农药及植物生长激素

D.不使用农药、化肥

题型:单项选择题

在锯木料时,一般先在木板上画出两点,然后过这两点弹出一条墨线,这是因为______.

题型:单项选择题

入夏以来,某公司反复收到办公室职员反映,说他们在工作时均出现呼吸道干燥、鼻塞、头痛、思想不集中、胸闷、憋气,且易感冒、易疲劳,请卫生防疫部门监测发现,均为密闭式空调房,空气循环使用,你认为该现象是

A.建筑物相关性疾病

B.空调综合征

C.军团病

D.流感流行

E.过敏反应

题型:单项选择题

地下车库火灾特点是()。

A、爆炸危险性大

B、火势蔓延快,损失大

C、易引起地面建筑燃烧

D、车辆疏散困难

E、易形成连锁反应

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