一般乒乓球胶皮有几种（）、生胶、长胶、防弧胶皮。
参考答案：反胶
Hello.Is Jim there?（）
A.This is Jim. Who's speaking, please?
B.I'm afraid I won't be free.
C.This is the right number.
D.There's no hurry.
仪表的测量范围和电流互感器变比的选择，宜满足当电力装置回路以额定值的条件运行时，仪表的指标在标度尺的80%～100%处。( )
