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"Teacher, when I synthesize crystals, I need to find different conditions to synthesize them, but there are too many tests. Do you have any better methods?" "What do you synthesize crystals for?" "Of course, it is to test its performance." "Then why do we stick to the need to synthesize crystals before testing properties? We can test properties with the results of each time. Maybe we can find better substances, can't we?" "Ah! Yes, thank you, teacher, I'll try it!" In an exchange with Mr. Sun Yimin, the teacher proved once again the correctness of the sentence "Don't stick to books and documents" while solving the problems of the team members.Information on key parts of fire safety in the unit (place)住在阿佐谷小区的小学4年级学生泽渡悠真，对即将接近地球的“SHⅢ·厄尔维尔彗星”着迷。Note: The core step is actually only one step. After the host computer is connected to the computer and the driver is installed, press and hold the reset key to start the machine, and then swipe the machine through hakchi according to the prompt. It is very simple.Add a rule at the end of the specified chain of the specified table. The-A option means that the rule is added at the end of the corresponding chain. When the-t option is omitted, it means that the rule in the filter table is operated by default.FLAG_ACTIVITY_SINGLE_TOP: also equivalent to singleTop configured in mainfest;