本特利位移监测器零点的间隙电压值是１V。
参考答案：错
My classmates were playing happily _____ I got to the park. [ ]
A. when
B. before
C. after
下列哪个选项是javax.swing.JApplet的父类
A．javawpanel
B．javappleApplet
C．javawframe
D．javawWindow
