修复了一些问题

code/CPU类的定义和使用——9-02.cpp

@@ -31,9 +31,9 @@ public:
             default: rank_str = "Unknown Rank";
         }
 
-        std::cout << "rank: " << rank_str << std::endl;
-        std::cout << "frequency: " << frequency << std::endl;
-        std::cout << "voltage: " << voltage << std::endl;
+        std::cout << "rank:" << rank_str << std::endl;
+        std::cout << "frequency:" << frequency << std::endl;
+        std::cout << "voltage:" << voltage << std::endl;
     }
 
     void run() {