【单选题】以下不属于实体—关系模型组成要素的是( )
【单选题】某土样液限 W L =36% ,塑限 W P =21% ,天然含水量 W=26% ,则该土的液性指数 为( )。
【判断题】Multimodal transport means the goods are carried by at least two modes of transport under at least two multimodal transport operators.
【判断题】Operator-Precedence parsing cannot handle the unary minus when we have also the binary minus in our grammar. The best approach to solve this problem, let the lexical analyzer handle this problem. The ...
【判断题】The two & operators in the following statement have the same meanings.Circlecircle1,&circle2=circle1,*p=&circle2;
【判断题】If there two operators , can they obey the commutative law?