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【多选题】
动词包括下列哪三类A.
判断动词
B.
能愿动词
C.
动态动词
D.
情态动词
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反馈参考答案：
举一反三
【单选题】A person pulls a box along the ground at a constant speed. If we consider Earth and the box as our system, what can we say about the net external force on the system?
A.
It is zero because the system is isolated.
B.
It is nonzero because the system is not isolated.
C.
It is zero even though the system is not isolated.
D.
It is nonzero even though the system is isolated.
E.
none of the above
【简答题】利用左图所示图片,制作出如右图所示的木板雕花效果。
【简答题】Consider a dynamic system
【简答题】利用左图所示图片,制作出如右图所示的扇子效果。
参考解析：
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