There is a screw hole at the bottom of the B-version IC695CPE310 without any identification. I want to know if this place needs to be grounded? There is no description in the manual, could anyone help me? Thank you.
B型IC695CPE310底部有一个螺丝孔，没有任何标识。我想知道这个地方是否需要接地？手册中没有描述，谁能帮我？谢谢。