Is the appointment of worker-directors to be mandatory?工人董事的任命是不是强制性的？Islanding detection is a mandatory function for grid - connected photovoltaic ( PV ) converters .孤岛检测是 光伏 并网逆变器所必备的功能.Competent geologic advice is man...
The aims of the treaty are stated in its preamble.条约的宗旨已在序言中说明。"I would like you to return to the villa as soon as possible," she said without preamble.她开门见山地说：“我想让你尽快回到别墅。”The controversy has arisen over the text of the...