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【单选题】
Figure 5.1 illustrates the steel market for Mexico, assumed to be a "small" country that is unable to affect the world price. Suppose the world price of steel is given and constant at $200 per ton. Now suppose the Mexican steel industry is able to obtain trade protection. Consider Figure 5.1. With free trade, the quantity of steel imported by Mexico equals: Figure 5.1. Alternative Nontariff Trade Barriers Levied by a "Small" Country
A.
2 tons
B.
4 tons
C.
6 tons
D.
8 tons
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【单选题】点沿其轨迹运动时,关于切向加速度【图片】和法向加速度【图片】,以下说法正确的是( )
A.
若 ,则点作变速曲线运动
B.
若 ,则点作匀速曲线运动
C.
若 ,则点作匀速曲线运动
D.
若 ,则点作变速曲线运动
【单选题】When they had finished playing, the children were made to ______ all the toys they had taken out.
A.
put off
B.
put up
C.
putout
D.
put away
【简答题】销售订单有哪些形成方式,它们各自都起到什么作用?
【简答题】What kind of children can enter the theatre? Children______can enter the theatre.
【单选题】点沿其轨迹运动时,关于切向加速度 和 法向加速度 , 以下说法正确的是( )
A.
若 ,则点作匀速曲线运动
B.
若 ,则点作变速曲线运动
C.
若 ,则点作匀速曲线运动
D.
若 ,则点作变速曲线运动
【简答题】销售订单有哪些形成方式,它们各自都起到什么作用?
【单选题】When they had finished playing, the children were made to ______ all the toys they had taken out.
A.
put out
B.
put off
C.
put up
D.
put away
【多选题】在下列关于加速度的表述中,正确的是
A.
质点沿x 轴运动,若加速度小于 0 ,则其必作减速运动
B.
质点作圆周运动时,其加速度方向总是指向圆心
C.
质点在曲线运动中 ,其加速度一般不为零
D.
质点作 一般 曲线运动时,其加速度方向总是指向曲线凹的一侧
E.
若质点的加速度为恒矢量,则其运动轨迹必为直线
F.
质点作抛物线运动时,其法向加速度 和切向加速度 是随时间不断变化的,因此,其合加速度 也是随时间变化的
G.
质点做圆周运动,法向加速度一般可以为零,切向加速度也可以为零
H.
质点做圆周运动,法向加速度一般不为零,切向加速度可以为零
I.
质点做圆周运动, 一般情况下, 法向加速度和切向加速度都可以为零
【单选题】When they had finished playing, the children were made to ______ all the toys they had taken out.
A.
put off
B.
put out
C.
put up
D.
put away
【单选题】点沿其轨迹运动时,关于切向加速度【图片】和法向加速度【图片】,以下说法正确的是( )
A.
若 ,则点作变速曲线运动
B.
若 ,则点作匀速曲线运动
C.
若 ,则点作变速曲线运动
D.
若 ,则点作匀速曲线运动
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