private void comboBox_SyncComNum_DropDown(object sender, EventArgs e)
{
COM_Op.comboBox_COMNumber_DropDown(comboBox_SyncComNum, sync_com.serialport);
}
private void comboBox_COMNumber_DropDown(object sender, EventArgs e)
{
COM_Op.comboBox_COMNumber_DropDown(comboBox_COMNumber, main_com.serialport);
}