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【多选题】
在流动的完全湍流区，当e／d一定时，因流体内摩擦引起的机械能损失( )，摩擦系数λ( )；在层流区，因内摩擦引起的机械能损失( )，摩擦系数λ( )。A.
与流速的一次方成正比；
B.
与流速的平方成正比；
C.
与流速无关；
D.
与流速成反比
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【多选题】Task 14 Get Along Well with Your Boss You work hard. And you think that you’ve done a lot for the company. But you don’t get a promotion in several years. At this moment, you should really 1__________...
A.
think over
B.
major
C.
hands
D.
paid
E.
important
F.
useful
G.
meaningful
H.
style
I.
view
J.
career
【简答题】Directions: The
following is a list of airport items. After reading it, you are required to
find the items equivalent to ( 与 ... 等同 ) those given in Chinese in the table
below. Then you should put the...
【单选题】关于数码器，以下说法错误的是 。
A.
共阳极接法的数码管需要高电平信号驱动。
B.
LCD 液晶显示器需要有背光才能显示。
C.
LED 发光二极管显示器自己发光，更适合于户外使用。
D.
驱动数码管时需要考虑限流措施。
【简答题】使用共阴极接法的LED数码管时， a~g应接输出 [填空(1)] 有效的显示译码器；使用共阳极接法的LED数码管时， a~g应接输出 [填空(2)] 有效的显示译码器，这样才能显示0~9十个数字。A. 高电平B. 低电平
【简答题】使用共阳极接法的 LED 数码管时,“ COM ”端应接( 1 ), a~g 应接输出( 2 )有效的显示译码器,这样才能显示 0~9 十个数字。
【简答题】A. Bill Gates enjoyed playing with earthmoving equipment B. Do you think geniuses are funny or strange? C. Leonardo da Vinci was well known for rideing horses. D. Travelling is a good way for ideas. E...
【单选题】Which of the following is NOT true about Andrew Carnegie ?
A.
He thought individuals should progress through hard work .
B.
H e felt that the wealthy should use their fortunes for the benefit of society.
C.
He prefer red to provid e opportunities that would allow other s to help themselves.
D.
He thought that charity was a good way to help the poor.
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