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【判断题】
RFID can realize self-checkout in supermarkets.A.
正确
B.
错误
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反馈参考答案：
举一反三
【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】An object of mass 0.50 kg, hanging from a spring with a spring constant of 8.0 N/m, is set into a simple harmonic motion. What is the maximum speed of the object if its maximum displacement is 0.10 m?
A.
0.20m/s
B.
0.40m/s
C.
0.80m/s
D.
1.60m/s
【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
【简答题】____ punishment is not a good way to educate children. So no school is allowed to do that.(Mental, Physical)
【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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