主、俯、左三个视图中有错误的视图是（ ） A、主视图 B、俯视图 C、左视图和俯视图 D、主视图和左视图……

问答题What is the difference between derivational morphemes and inflectional morphemes? Derivational morphemes are used to form new words while inflectional morphemes only indicate aspects of the (1) function of a word, such as tense, number, possession or comparison.

问答题PLC的图形化语言有 、顺序功能图和功能块图。