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【单选题】
With which of the following statements concerning the condition of the Anasazi at the time of their evacuation would the author be most likely agree?A.
Disruption of weather patterns is a plausible explanation of the Anasazi's evacuation, but insufficient when taken individually.
B.
A religious crisis may have contributed to lower crop fertility, resulting in the Anasazi's malnourishment.
C.
The Anasazi spiritual crisis may have been exacerbated by the poor performance of their crops after the disruption of weather patterns.
D.
The Anasazi may have been attempting to move toward a diversification of their religious beliefs long before the disruption of weather patterns.
E.
The Anasazi spiritual crisis may have contributed to increased balkanization, creating a vicious cycle of hostility within Anasazi society.
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【简答题】某液压泵的工作压力 p = 10MPa ,转速 n = 1450r/min ,泵的排量 V = 46.2mL/r ,容积效率 η V = 0.95 ,总效率 η = 0.9 ,求液压泵的输出功率 P 为( ) KW ,驱动该泵所需电动机的功率 P 电 为( ) KW。 结果保留两位小数
【判断题】During the interview, it ’ s good for you to introduce your professional knowledge.
A.
正确
B.
错误
【简答题】土壤是岩石经过 、 剥蚀 、 搬运 和 等作用形成的 。
【简答题】某液压泵排量V为10mL/r,工作压力为10MPa,转速为1500r/min,泵的泄漏系数为kl =2.5×10-6mL/Pa·s,机械效率为0.90,试求:1)输出流量;2)容积效率和总效率;3)输出和输入功率;4)理论转矩和实际输入转矩。
【简答题】岩石经过( )、( )、( )等作用形成土壤岩石,再进一步风化形成土壤矿物质。
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【判断题】During the interview, it ’ s good for you to introduce your professional knowledge.
A.
正确
B.
错误
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