When Microsoft Multiplan and Microsoft Excel were released, they also assumed that 1900 was a leap year. This assumption allowed Microsoft Multiplan and Microsoft Excel to use the same serial date system used by Lotus 1-2-3 and provide greater compatibility with Lotus 1-2-3. Treating 1900 as a leap year also made it easier for users to move worksheets from one program to the other.
虚拟线程的核心思想就是：把线程从“等IO”中解放出来，让它们去做其他工作。
，这一点在pg电子官网中也有详细论述
An explosion at a Jewish school in Amsterdam on Saturday came a day after a suspected arson attack on a synagogue in Rotterdam the day prior.
H = Height of focuser = 96mm