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【单选题】
（单选）气、液两上以喷射状态接触时，传质表面主要是（）A.
气泡的表面；
B.
液膜的表面；
C.
液滴的表面；
D.
以上均不正确。
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反馈参考答案：
举一反三
【简答题】用参数R编程时，当圆弧___180°时，用+R表示圆弧半径。当圆弧 180°___时，用﹣R表示圆弧半径。
【简答题】Some learn by taking notes and charts and others learn by ______.
【单选题】Falls Company has budgeted sales of $120,000 based on 80,000 units. The margin of safety is $1,000. What is the break-even point in dollars?
A.
$81,000
B.
$119,000
C.
$120,000
D.
$121,000
【单选题】A company produces and sells a single product.Budgeted sales are $2.4million,budgeted fixed costs are $360,000 and the margin of safety is $400,000.What are budgeted variable costs?
A.
$1.640million
B.
$1.728million
C.
$1.968million
D.
$2.040million
【简答题】已知大圆的半径为R，小圆的半径为r，圆环面积为S． （1）用代数式表示圆环的面积S； （2）当R=5，r=3时，求S（结果保留一位小数）．
【简答题】电流所做的功,简称( ) ,用字母( ) 表示,单位是( ) ;电流在单位时间内所做的功,称为( ) ,用字母( ) 表示,单位是( ) 。
【单选题】A company produces and sells a single product. Budgeted sales are $2.4 million, budgeted fixeds costs are $360,000 and the margin of safety is $400,000. What are budgeted varaible costs?
A.
$1.640 million
B.
$1.728 million
C.
$1.968 million
D.
$2.040 million
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