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【单选题】
下列说法中正确的是(  )
A.
重10N的物体加速下落l0m,重力做的功一定是l00J
B.
用力提10N重的物体上升10m,提力做的功一定是100J
C.
将重10N的物体沿水平方向匀速推动10m,推力做的功一定是100J
D.
用10N的水平推力将重物推动8m后,撤去推力、物体又前进2m后静止,推力做的功一定是100J
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【判断题】Reader类有方法可以读取并返回浮点数和双精度数。这种说法对还是错?A. 对 B. 错
A.
正确
B.
错误
【单选题】下列哪种属于动力对流冲击力:
A.
山坡迎风面对空气的抬升
B.
气流辐合辐散时造成的空气水平运动
C.
气温变化造成的空气抬升或下降
【判断题】不包含任何闭回路的变量组,必有孤立点。A. 对 B. 错
A.
正确
B.
错误
【简答题】When building m______ cost more, the price of houses increases.
【判断题】曳引减速器的作用是降低转速和增大转矩.()
A.
正确
B.
错误
【单选题】mso-hansi-font-family:"Times New Roman"">裙腰在低腰状态时的造型为
A.
mso-hansi-font-family:"Times New Roman"">扇面形
B.
mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"; mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">矩形
C.
mso-hansi-font-family:"Times New Roman"">倒置的扇面形
D.
mso-bidi-font-family:"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA">梯形
【判断题】曳引减速器的作用是降低转速和增大转矩。
A.
正确
B.
错误
【单选题】When marginal cost exceeds average total cost,
A.
average fixed cost must be rising.
B.
average total cost must be rising.
C.
average total cost must be falling.
D.
marginal cost must be falling.
【单选题】Marginal cost is rising when marginal cost is:
A.
positive.
B.
less than average cost.
C.
greater than average cost.
D.
none of these.
【单选题】Marginal cost is equal to average total cost when( )
A.
average variable cost is falling.
B.
average fixed cost is rising.
C.
marginal cost is at its minimum
D.
average total cost is at its minimum
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