A line 3 m from and parallel to the net is considered the "_______"(进攻线)
A. front line
B. back line
C. middle line
D. attact line
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The diameter of the ping-pong ball is ___.
A. 38mm
B. 40mm
C. 40+mm
D. 41mm
Which one below is not the requested color of the ball in the rule book.
A. orange
B. white
C. black
International rules specify that one side must be ___while the other side must be ____.
A. red;white
B. red;gray
C. black;purple
D. black;red
What’s the height of the net?
A. 15.25
B. 14.98
C. 12.56
D. 15.65
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