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【Process Engineering Division – Chemical Components Forum – Daily Question – Questions 04–30】In mechanical drawing, there are two systems for determining the datum in terms of fit: the hole-based system and the shaft-based system. Give priority to ( ). Notes for filling in the blanks: Questions are valid only on the day they are posed (3 correct answers and 1 incorrect answer; posts filled with irrelevant content will be deleted). Replying extensively to previous posts is considered posting spam, and such actions will result in no points or points awarded at the discretion of the organizers. =The G Bore size section is about to be updated. Topics related to chemical engineering software, along with their answers, can be sent to my email address 12315827@qq.com. Once they are included, rewards of 10–100 wealth points will be given depending on the quality and quantity of the questions. If you have a large number of questions, you can contact me through the in-site messaging system; rewards will be provided in one go, and they are not limited to wealth points only. These question sets will serve as the source for the “One Question per Day” section in the chemical engineering software category. First come, first served – rewards will be given based on the first email received. Please include the forum username and UID in the email subject.