与紧前工作之间存在虚工作可能的情况中,说法正确的有()。
电路如题2图所示,设二极管VD的导通压降为O.7V,则
4元线性方程组的基础解系所含解向量的个数为().
Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
They have been through a lot together in their fifty years of ( ). (marry)