Goods of average quality is called ( ) A: GMD B: FAQ C: Grade D: Selected

写出下列正弦电压的相量式，画出相量图，并求其和：[tex=7.357x1.5]s2RNrSZe2D8ifzjv/+ANjXjWgvUl+gmD/SRzEHCp66zIE2DFesJV3KNoio9DRMgc[/tex]

设g(t)满足g(t＋T)=g(t),又随机变量专在(0,T)上服从均匀分布,记[tex=5.643x1.357]gmD/f7v5vW+xI3kZrjvk6Q==[/tex],试证:[tex=15.643x2.786]bIgLT6KDr+VYjUaMoSoGUQvrVRNI7cA9HZ569WdkMwqlZNutxikHpCJWDnm82kLre8u/OZnmwpcJing1BuRoPBfoXrvauD4DN36FOVDgmsw=[/tex]