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【简答题】
已知某厂商的生产函数为Q=2*L 3/8 *K 5/8 ,设w=3元,r=5元。 (1)产量Q=10时的最低成本支出为 ,L的使用量为 ,K的使用量为 。 (2)总成本为c=200厂商均衡的Q为 ,L为 ,K 为 。
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【单选题】Which of the following quote would the journalist least probably use if he wants to prove “ Huawei founder defiant in the face of U.S. action ” ?
A.
“We are very grateful to the U.S. companies. They have made a lot of contributions to us. Many of our consultants are from American companes like IBM.”
B.
"Instead, we should grow together. But if there is a supply shortage, we have a backup. In the "peace period", half of our chips are from the US companies and half from Huawei. We cannot be isolated from the world."
C.
The 90-day extension “doesn't mean much” and Huawei is fully prepared for the American actions, Ren said .
D.
Huawei reacted to Go ogle’s decision to stop allowing updates by saying the Chinese company had “made substantial contributions to the development and growth of Android around the world.”
【单选题】下列关于杠杆或能量守恒的说法中，正确的是（ ）
A.
在使用杠杆的过程中，不可能既省力又省距离
B.
天平是等臂杠杆，既省力又省距离
C.
由能量守恒定律可知，永动机总是可以制造成功的
D.
由能量守恒定律可知，滑轮组的机械效率可以超过100%
【简答题】什么情况下需要采用水蒸汽蒸馏？
【简答题】怎样准确把握“”重要思想的核心观点?
【单选题】关于简单机械，下列说法正确的是（ ）
A.
对于杠杆，动力臂越长就越省力
B.
对于斜面，斜面越长越省力
C.
使用任何机械，绝对不可能省功
D.
天平是测物体质量的，所以在完全失重的环境中也可以测物体质量
【单选题】盘击式粉碎机的筛网对转子的包角 。
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