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【单选题】
在MGB1420万能磨床晶闸管直流调速系统的主回路中，直流电动机M的励磁电压由220V交流电源经二极管整流取得()左右的直流电压。A.
110V
B.
190V
C.
220V
D.
380V
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【简答题】He would have given you more help, if he ______ (not be) so busy.
【单选题】The seventh glass of soda that Tim consumes will produce an extra benefit of 10 cents and has an extra cost of zero (Tim is eating at the cafeteria). The cost-benefit principle predicts that Tim will:
A.
realize he has had too much soda to drink and go home.
B.
drink the seventh glass and continue until the marginal benefit of drinking another glass of soda is zero.
C.
volunteer to empty out the fountain.
D.
not drink the seventh glass.
【单选题】He is always thinking more of himself, seldom, _____, offering to help others. [ ]
A.
if never
B.
if ever
C.
if possi ble
D.
if any
【单选题】题目: 静脉注射甘露醇引起尿量增加是通过 编号: CQAAQBH
A.
增加肾小球滤过率
B.
增加肾小管液中溶质的浓度
C.
减少抗利尿激素的释放
D.
减少醛固酮的释放
E.
减少远曲小管和集合管对水的通透性
【简答题】螺纹的要素包括( )、直径、( )、螺距和导程、( )。且只有这些要素完全相同的内、外螺纹才成相互旋合。
【单选题】If you offer him some help this time, since he once helped you, that would be ____.
A.
equal
B.
more equal
C.
fairer
D.
more fair
【单选题】Sue consumes only sandwiches and soda and is at her best affordable point. The price of a sandwich falls. The substitution effect is that Sue substitutes ________ for ________. The income effect is th...
A.
sandwiches; soda; buys less of both goods
B.
soda; sandwiches; buys more soda and fewer sandwiches
C.
sandwiches; soda; buys more of both goods
D.
soda; sandwiches; buys less soda and more sandwiches
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