Trump approves Matisse again: letting someone submit a resignation letter is to save face for him, he is useless to Obama, it is the same to me
On the evening of the 4th local time, US President Trump once again “fired” his former defense minister, James Mattis, who had severely reprimanded him, and this time brought John Kelly, the former director of the White House Office.
Earlier in the day, Kelly “made a speech for Matisse” in an interview. According to a report from the US “Business Insider” website, Kelly not only called Matisse a “respectable person”, but also refuted the president’s statement about the dismissal. “The president didn’t fire him. He didn’t ask (Matisse) to resign,” Kelly said. “The president obviously has forgotten how this happened, or is confused about it.”
As we all know, in x-ray photography, the size of the X-ray collimator
and the accurate positioning of the X-ray beam center directly affect the quality of the X-ray photo. Especially in the projection of some special positions, such as mastoid, optic nerve hole, etc., if the center of the X-ray collimator and the center of the X-ray tube are slightly offset, the photo may not meet the diagnostic requirements. It can be seen that the adjustment of the center of the X-ray collimator optical device is a problem that cannot be ignored. At present, there is no special test tool for the adjustment of the center of the X-ray collimator, which brings inconvenience to the adjustment work and causes unnecessary manpower and waste of film. We have discussed the center adjustment of the X-ray beam collimator, and made a simple debugging board for the center adjustment of the X-ray beam optics.