【判断题】Usually the higher-level goals only can be reached as the lower-level goals have been attained. ( )
【判断题】The convenience stores usually charge higher prices than ordinary grocery stores or supermarkets.
【多选题】墨子认为“喜”、“怒”()等情绪都是无用的,应去之。
【简答题】从公式中可以得出:δ 0 的减小会导致( )增大;δ 0 过小还可能引起电容器击穿或短路。为此,极板间可采用( )的材料 ( 云母、塑料膜等 ) 作介质。