RGCC型高压开关柜标准单元设置的设备有真空断路器、可见的三工位开关、母线、观察窗等。（）
参考答案：错
依次连结菱形四条边的中点所构成的四边形是 [ ]
A．菱形
B．矩形
C．一般平行四边形
D．一般四边形
The theory of language underlying Audiolingualism was derived from ______ in the 1930s and the 1940s in America.
A. behaviourist linguistics B. functional linguisticsC. structural linguistics D. transformational generative linguistics
