在冬季，深冷装置空冷器出口物流温度和空气温度的温差很小时，为防止水化物的生成结冰，最佳的措施是（）或风机叶片角度调小。_轻烃装置操作(中级工)_全学科试题题库

当前学科：轻烃装置操作(中级工)

题目：单选
在冬季，深冷装置空冷器出口物流温度和空气温度的温差很小时，为防止水化物的生成结冰，最佳的措施是（）或风机叶片角度调小。
答案： <查看本题扣1积分>

查看答案

答案不对？请尝试站内搜索

推荐知识点:

伸直型肱骨髁上骨折常见的并发症是（）

何谓分离细胞的阳性选择法和阴性选择法?

复元活血汤和血府逐瘀汤均具有的功效是（）

较小的方形田块儿，田间检验的取样方法是（）取样法。

承受轴向荷载摩擦桩入土深度的控制应采用（）

By about A. D. 500 the Mound Builder culture was declining, perhaps because of attacks from other tribes or perhaps because of severe climatic changes that undermined agriculture. To the west another culture, based on intensive agriculture, was beginning to flourish. Its center was beneath present day St. Louis, and it radiated out to enclose most of the Mississippi watershed, from Wisconsin to Louisiana and Oklahoma to Tennessee. Thousands of villages were included in its orbit. By about A. D. 700 this Mississippian culture, as it is known to archaeologists, began to send its influence eastward to transform. the life or most of the less technologically advanced woodland tribes. Like the Mound Builders of the Ohio region, these tribes, probably influenced by Meso-American cultures through trade and commerce, built gigantic mounds as burial and ceremonial places. The largest of them, rising in four terraces to a height of one hundred feet, has a rectangular base of nearly fifteen acres, larger than that of the Great Pyramid of Egypt. Built between A. D. 900 and 1100, this huge earthwork faces the site of a palisaded(用栅栏围起的)Indian city which contained more than one hundred small artificial mounds marking burial sites. Spread among them was a vast settlement containing some 30,000 people by current estimations. The finely crafted ornaments and tools recovered at Ca-hokia, as this center of Mississippi culture is called, include elaborate ceramics(陶瓷制品), finely sculpted stonework, carefully embossed and engraved copper and mica(云母)sheets, and one funeral blanket fashioned from 12,000 shell beads. They indicate that Cahokia, was a true urban center, with clustered housing, markets, and specialists in tool-making, hide-dressing patting, jewelry-making, weaving, and salt-making.What is the main topic of the passage? ______A．The Mississippian culture.B．The decline of Mound Builder culture.C．The architecture of Meso-American Indians.D．The eastern woodlands tribes.

对原油洗舱使用的（）要进行压力试验。

关于破伤风梭菌毒力试验，错误的是（）

浸渍试剂滤料法具有物理(吸附和过滤)和化学两种作用，能同时将气态和气溶胶污染物采集下来。()A.正确B.错误

蛇床子的功效是（）