不是用QStringRef，太容易出错。

Signed-off-by: facat@lab.com <facat@lab.com>

testHasttable/disconnector.h

@@ -5,12 +5,12 @@
 class Disconnector:public BasicElementInfo
 {
 public:
-    Disconnector();
+    explicit Disconnector(QObject *parent = 0);
     virtual bool parse(QXmlStreamReader& reader);
 protected:
-    QStringRef terminalA;
-    QStringRef terminalB;
-    QStringRef equipmentContainer;
+    QString terminalA;
+    QString terminalB;
+    QString equipmentContainer;
     virtual bool derivedParse(QXmlStreamReader& reader);
 private:
     bool isTerminalA;