配制防水混凝土时,胶凝材料总用量不宜小于kg/盘,水胶比不得大 于
A speech presenting the main speaker to the audience is called a speech of ____.
A speech announcing the winner of an award and giving the award to the recipient is called a speech of ____.
A speech that gives thanks for a gift or an award is called a(n) ____ speech.