【判断题】最短的渠道是生产者——消费者,但是这种渠道是不存在的。
【判断题】螺纹代号M表示普通螺纹,Rc和G表示管螺纹,Tr表示梯形螺纹。( )
【简答题】When you wish to give someone a gift, it is always good to remember some of the basic rules. Consider the ___1_____ and and the length of your acquaintance as well as the occasion. You should know...
【简答题】螺纹代号M表示 螺纹,Tr表示 螺纹,G示 螺纹。
【单选题】代号为: Tr40×14(P7)-7H-L的螺纹,14代表螺纹的 。
【单选题】It is always good manners to ( ) others.
【简答题】阅读下列短文,从每题所给的四个选项(A、B、C、D)中,选出最佳选项,并填写在答题卡上。 There are many different kinds of disasters around the world. As an you know what to do during a disaster, but what about the children? Some s t...
【单选题】在螺纹的标记Tr24×12(p6)中,Tr代表( )。