the strange phenomenon: the emiited signal cannot be received by the slot function

[zhaolewen]

file1.cpp:

connect(this, SIGNAL(newOrbCorrections(QList<t_orbCorr>)), 
          BNC_CORE, SLOT(slotNewOrbCorrections(QList<t_orbCorr>)));
 
  connect(this, SIGNAL(newCorrLine(QString, QString, bncTime)), 
	  BNC_CORE, SLOT(slotNewCorrLine(QString, QString, bncTime)));

connect(this, SIGNAL(newOrbCorrections(QList<t_orbCorr>)), 
          BNC_CORE, SLOT(slotNewOrbCorrections(QList<t_orbCorr>)));

  connect(this, SIGNAL(newCorrLine(QString, QString, bncTime)), 
	  BNC_CORE, SLOT(slotNewCorrLine(QString, QString, bncTime)));

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file2.cpp:

void t_bncCore::slotNewCorrLine(QString line, QString staID, bncTime coTime) {
 
	QMutexLocker locker(&_mutex);
	……………………………………
}
 
void t_bncCore::slotNewOrbCorrections(QList<t_orbCorr> orbCorrections) {
  QMutexLocker locker(&_mutex);
  ……………………………………………………
}

void t_bncCore::slotNewCorrLine(QString line, QString staID, bncTime coTime) {

	QMutexLocker locker(&_mutex);
	……………………………………
}

void t_bncCore::slotNewOrbCorrections(QList<t_orbCorr> orbCorrections) {
  QMutexLocker locker(&_mutex);
  ……………………………………………………
}

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main.cpp

{
             emit newCorrLine("ddd", _staID, _lastTime);
	emit newOrbCorrections(orbCorrections);
}

{
             emit newCorrLine("ddd", _staID, _lastTime);
	emit newOrbCorrections(orbCorrections);
}

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the slot function slotNewCorrLine can be correctly called ，but the function slotNewOrbCorrections can not be called.
I am very confusing about the phenomenon.
Looking forward to your answer,Thank you very much.