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问题 单项选择题

下述哪一种技术属于频谱多普勒技术

A.M型彩色多普勒 

B.连续波多普勒 

C.彩色多普勒能量图 

D.伪彩色编码二维超声显像 

E.彩色多普勒血流显像 

答案

参考答案：B

单项选择题

Your company has established a reward and recognition system for its project management professionals. Project cost performance is used as a criterion to determine rewards. What should you do to ensure that rewards reflect actual performance

A) Consider overtime work as part of the job.
B) Prepare a cost baseline.
C) Use earned value management to monitor performance.
D) Estimate and budget controllable and uncontrollable costs separately.
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单项选择题

学生驾驶员不得在空中或地面能见度白天小于（）公里、夜间小于（）公里的飞行中担任航空器机长。

A.3；5

B.5；10

C.5；8
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