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【判断题】
平面力偶系的合成结果是一力偶。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】下面哪一组向量是线性方程组【图片】的一个特解和对应齐次方程组的一组基础解系：
A.
特解 (0,-1.8889,0.7778,0); 基础解系 (-1.2857,0.1429,1.0000,0),(0.5000,-0.5000,0,1.0000)
B.
特解 (-1.8889,0,0.7778,0); 基础解系 (-1.2857,0.1429,0,0),(0.5000,-0.5000,0,1.0000)
C.
特解 (0.5000,-0.5000,0,1.0000); 基础解系 (-1.2857,0.1429,1.0000,0),(0,-1.8889,0.7778,0)
D.
特解 (-1.2857,0.1429,1.0000,0); 基础解系 ,(0,-1.8889,0.7778,0), (0.5000,-0.5000,0,1.0000)
【单选题】I _____ have a business trip to Hong Kong tomorrow. Can you help me prepare for it? [ ]
A.
Have gone to
B.
am going to
C.
was going to
D.
have been to
【简答题】阅读理解。 Tired? Bored? Hungry? And more miles left to go? Help pass the time on your trip: play a ! Everyone knows that a long bus ride can make even the most exciting field trip seem boring. When th...
【单选题】—Would you help me plan a trip? —_________________
A.
You bet!
B.
Yes, I can.
C.
Not at all.
【简答题】Plan on traveling around the USA this summer. If you need help in arranging the trip, or want ideas about where to go and what to do, there are a number of outstanding websites that can make your Amer...
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