如果示波器上的水平和垂直偏转板上加上相位差为180°、同频等幅的正弦信号,请逐点画出荧光屏上的显示图形
参考答案:
We should support the zoos so that they will have enough money to______ the animals. [ ]
A. take interest in
B. take possession of
C. take care of
D. take hold of
企业检验商品必须有( )
A.检测和调节温、湿度的设施B.设置中药标本室(柜)C.明亮、整洁、无环境污染源D.专门的生活区和办公区E.必要的场所及与经营品种和规模相适应的化验仪器、设备