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【单选题】
一个光子和一个电子具有相同的波长,则A.
光子具有较大的动量
B.
电子具有较大的动量
C.
电子与光子的动量相等
D.
电子和光子的动量不确定
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举一反三
【判断题】Ms. Zhang and Victor finally agree on confirmed irrevocable letter of credit as the mode of payment.
A.
正确
B.
错误
【判断题】Task 3 Ms. Zhang is meeting Victor to discuss the mode of payment. Listen to the conversation and decide whether the following statements are true (T) or false (F). □ 1. Victor represents the buyer o...
A.
正确
B.
错误
【判断题】□ 6. Ms. Zhang and Victor finally agree on confirmed irrevocable letter of credit as the mode of payment.
A.
正确
B.
错误
【单选题】According to the fifth paragraph, the scientists think the wolves' decline in number is______.
A.
devastating
B.
natural
C.
adjustable
D.
abnormal
【简答题】“Li lei , which is ____ day of a week ? ”“Thursday , I think.” A . fifth B . the fifth C . five D . the five
【单选题】The author is inclined to think that a fifth level
A.
would be little better than the fourth level
B.
may be a lot more satisfying level than the first four
C.
can be the last and most satisfying level
D.
will become attainable provided the government takes actions
【简答题】有关力偶的性质叙述不正确的是( ) A力偶对任意点取矩都等于力偶矩,不因矩心的改变而改变;B力偶有合力,力偶可以用一个合力来平衡;C只要保持力偶矩不变,力偶可在其作用面内任意移转,对刚体的作用效果不变;D只要保持力偶矩不变,可以同时改变力偶中的大小与力偶臂长短。
【单选题】The author tends to think that the fifth level __________
A.
would be little better than the fourth level
B.
may be a lot more desirable than the first four
C.
can be the last and most satisfying level
D.
will become attainable before the government takes actions
【简答题】力偶在坐标轴上的投影的代数和为（）；力偶对其作用平面内任一点的矩都等于（）。
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