为何供回油都有流量测点装置?
参考答案:
1)正常情况下炉不用油时可以利用供回油流量表检查系统是否漏油;
2)测量锅炉燃油量。
In one sense, we can trace all the problems of the American city back (91) a single starting point: we Americans don’t like our cities very much.That is, on the (92) of it, absurd. After all, more than three-fourths of us now live in cities, and more are (93) to them every year. We are told that the problems of our cities are (94) more attention in Washington, and scholarship has discovered a whole new (95) in urban studies. (96) , it is historically true: in the American psychology, the city has been a basically suspect institution, (97) with the corruption of Europe, totally lacking that sense of spaciousness and innocence of the (98) and the rural landscape.I don’t pretend to be a scholar on the history of the city in American life. But my thirteen years in public (99) , first as an officer of the U. S. Department of Justice, then as Congressman, and now as Mayor of the biggest city in America have taught me (100) too well the fact that a p antiurban attitude (101) consistently through the mainstream of American thinking. Much of the (102) behind the settlement of America was in reaction (103) the conditions in European industrial centers and much of the theory (104) the basis of freedom in America was linked directly to the availability of land and the perfectibility of man outside the corrupt influences of the city.What has this to do with the predicament of the modern city I think it has (105) to do with it. For the fact is that the United States (106) the federal government, which has historically established our national priorities, has simply never thought that the American city was "worthy" of (107) —at least not to the (108) of expending any basic resources on it.Antipathy to the city predates the American experience. When industrialization (109) the European working man into the major cities of the continent, books and pamphlets appeared (110) the city as a source of crime, corruption, filth, disease, vice, licentiousness, subversion, and high prices.
A.many
B.much
C.lots
D.great
企业职工和部门的关系模式如下所示,其中部门负责人也是一个职工。
职工(职工号,姓名,年龄,月薪,部门号,电话,地址)
部门(部门号,部门名,电话,负责人代码,任职时间)
请将下面的SQL语句空缺部分补充完整。
CREATE TABLE部门(部门号CHAR(4)PRIMARY KEY,部门名CHAR(20),电话CHAR(13),负责人代码CHAR(5),任职时间DATE,FOREIGN KEY());
查询比软件部所有职工月薪都要少的职工姓名及月薪的SQL语句如下:
SELECT姓名,月薪FROM职工
WHERE月薪<(SELECT()FROM职工
WHERE部门号=());
A.月薪
B.ALL(月薪)
C.MIN(月薪)
D.MAX(月薪)