正胶反胶、直板横版、擦边球、弧圈球等是哪项体育比赛的用语？
参考答案：正胶反胶、直板横版、擦边球、弧圈球等是乒乓球比赛的用语。
Lucy’s new job paid twice as much as she had made ____ in the restaurant.
A．working
B．work
C．to work
D．worked
（）是水的介电常数。
A.78.3
B.2.284
C.20.7
D.42.5
