【单选题】下列哪个地段开始的演替是原生演替( )。
【单选题】We __ herewith our ladies catalogue for your reference.
【单选题】We return herewith one copy ____________ signed to you for our file.
【单选题】These issures were discussed at length during the meeting. The underlined part means__________.
【单选题】We herewith two copies of our illustrated catalogue for your consideration.
【判断题】出现真空的流体,其相对压强为正值,绝对压强为负值。
【单选题】We _________ herewith two copies of our illustrated catalogue for your information.
【单选题】We herewith two copies of our illustrated catalogue.
【单选题】We have the pleasure of sending you herewith our samples and literature______.
【单选题】从下列哪个地段开始的演替是原生演替( )。