‎光敏电阻是用硫化镉或硒化镉等半导体材料制成，工作原理基于内光电效应。‌

多项选择题机械手的工作方式有手动工作方式和（）工作方式。 A、单步 B、单周期 C、连续 D、回原点

单项选择题In international law, other than such rules as may be accepted by the state concerned, there are no rules whereby the level of armaments of a sovereign state can be limited, and this principle is valid for all states without exception. A、正确 B、错误