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【简答题】
分度圆半径与节圆相等时，标准齿轮传动的中心距是____（用d1、d2和/的公式表示）。
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举一反三
【单选题】The figure shows a graph of the market for pizzas in a large town. If the price falls from $10 to $7 per pizza, the quantity of pizzas demanded will
A.
increase by 20.
B.
increase by 30.
C.
decrease by 30
D.
decrease by 10.
【单选题】The figure shows that the maximum amount a person is willing to pay for the 400th pretzel
A.
is greater than the marginal social cost of the 400th pretzel.
B.
is less than the marginal social benefit of the 400th pretzel.
C.
and the marginal social benefit of the 400th pretzel are both $2.
D.
is greater than the marginal social benefit of the 200th pretzel.
【单选题】The figure shows a proton in a magnetic field. For which of the three proton velocities shown will the magnetic force be greatest?
A.
(a)
B.
(b)
C.
(c)
【单选题】The figure shows a position-versus-time graph of the motion of a car. Describe the velocity and acceleration during segments OA, AB, and BC. Which item is Not correct?【图片】
A.
In segment OA, the velocity is positive and constant.
B.
In segment OA, there is no acceleration.
C.
In segment AB, the velocity is increasing.
D.
In segment AB, there must be acceleration.
E.
In segment BC, the velocity is not constant.
F.
In segment BC, this velocity is greater in magnitude than the velocity in segment OA.
【单选题】The figure shows a linear (straight-line) demand curve. Starting at point A and then moving to point B and then point C, the price elasticity of demand
A.
increases.
B.
decreases.
C.
increases and then decreases.
D.
decreases and then increases.
【单选题】The figure shows a graph of the market for pizzas in a large town. No pizzas will be demanded unless price is less than
A.
$14.
B.
$0.
C.
$5.
D.
$12.
【简答题】Mr. Smith 36 from London. Now he is in China. He is 37 .He teaches 38 a middle school. He works very hard. His students like 39 very much. He can 40 a little Chinese. His students often teaches h...
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