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This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:If you pass the re-examination, you will pass the physical examination. After passing the political examination, the examinee can fill in the Air Force Flight Academy in the college entrance examination. As long as the test score exceeds the minimum undergraduate admission line, you can be admitted. The two levels of political review and achievement are relatively easy to pass.Nishiyuan also has two pairs of socks. The sister in one eye can be killed in the past.If there is no one tomorrow night, then I will delete the post.封侯有什么用？几时让我上沙场？这首诗，戚继光也没敢公布，只是随着他的那本兵书，不知什么时候，送给了什么人，流连辗转，竟让杨长帆看到了。如今必须要抢先一步，不仅仅是增强越国的实力，更重要的还是出于战略上的考虑。In the "Parameters" tab of the "Block Writing Palette", click "Flip Parameters", AutoCAD? The command window at the bottom prompts "Specify parameter position or [name (N)/label (L)/description (D)/palette (P)]", captures and clicks on the endpoint of the dash line below the elevation character figure; The command window then prompts "Specify the endpoint of the projection line" and drags the mouse horizontally for a certain distance before clicking the mouse. The command window prompts "Specify Tag Position" and clicks again nearby.