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【单选题】
各种各样的3D打印机中，精度最高、售价也相对最高的是（ ）？A.
个人3D打印机
B.
专业级3D打印机
C.
桌面级3D打印机
D.
工业级3D打印机
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反馈参考答案：
举一反三
【简答题】A good _____(educate) is the first step to a good job.
【简答题】用括号里的词的正确形式填空。 1. In the past, only a few children could get a good (educate). 2. After (finish) his homework, he went to bed. 3. Mike said that the sun (be) bigger than the moon. 4. Don't forget (clo...
【简答题】They had worked hard to earn more money in order to give their daughter a good (educate) .
【单选题】If an object of mass m moves with constant velocity v, the net force on the object is
A.
mg
B.
mv
C.
mv/t
D.
0
E.
None of these answers is correct.
【单选题】If an object of mass m moves with constant velocity v, the net force on the object is
A.
mg
B.
mv
C.
mv/t
D.
0
【单选题】A constant force of 20 N is applied to an object of mass 8.0 kg at an angle of 25° with the horizontal. What is the work done by this force on the object if it causes a displacement of 2.0 m along the...
A.
40 J
B.
0 J
C.
36 J
D.
19 J
【单选题】He is _______ scolding his child , which is not a good way to educate him.
A.
often
B.
usually
C.
always
D.
frequently
【简答题】They have a good _______( educate).
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