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【简答题】
立方体静止时的密度为 ,当它相对地面以速率u沿一条边运动时,地面观测者测得它的密度为 ,求 :
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反馈参考答案：
举一反三
【简答题】蜗杆与蜗轮的轴线在空间交错成（）角。
【单选题】在选择IT项目_____的阶段,组织定义项目范围而,利益,和约束。(140703班王柳译)In the _____ stage of selecting information technology projects, organizations define project scope, benefits, and constraints.
A.
项目计划project planning
B.
业务领域分析business area analysis
C.
资源分配resource allocation
D.
IT战略计划information technology strategy planning
【简答题】信息率失真理论是量化、数模转换、频带压缩和（）的理论基础。
【单选题】听力原文： President Bush has asked Congress to ratify an agreement to normalize U.S. trade with Vietnam. The president sent the agreement negotiated in the last year of the Clinton administration to Congr...
A.
The U.S. Congress has ratified the agreement to normalize U.S. trade with Vietnam.
B.
The agreement was negotiated in the last year.
C.
President Bush wanted to normalize overall ties between U.S. and Vietnam.
D.
The agreement has strong support among Vietnam War veterans.
【单选题】The U.S. Congress is the ____ of the British Parliament.
A.
copy
B.
contrary
C.
counterpart
D.
simulation
【单选题】听力原文： The U.S. Botanic Garden is America's plant museum. (26) Congress established the Botanic Garden as a center for the science of growing things. But the Garden is also a center of beauty. (28) The...
A.
For scientific research on the growing things.
B.
For make a center of beauty.
C.
For attracting more children to visit.
D.
For improving the environmental conditions.
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