This paper describes the situation of public welfare volunteerism, and conducted a survey in Zhejiang Province. According to the existing data, a survey method was designed, and a comparative study was carried out in the form of multi-stage sampling, simple random sampling and unequal probability sampling. In addition, a questionnaire was set up according to the existing data, and we also conducted a study on sample quality control. For example, the unqualified samples are discarded, and the final conclusion is that most people have a strong purpose to participate in public welfare, while the appeal and credibility of public welfare itself are almost ignored.
With the development of the network, online education has entered thousands of households, and the access to online education is also very simple. Due to the continuous development of online education, a variety of online examination systems with various characteristics have been derived. Considering the simplicity and convenience of the system and the stability of performance, we have developed an online examination system using SSM framework under B/S architecture, which can detect students 'learning status through online examination and automatic marking. And automatically analyze the error rate of each problem and the weakness of each student, so that the teacher can explain such exercises. It also contains the basic information of the student, such as the mobile phone number of the student's parents. If the student is found not to complete the examination, the teacher will also call the student's parents to remind them, and can also communicate with the student's parents appropriately. For the management of the test questions can be taken excel document import. Thus, it can greatly improve the generation of test papers compared with the traditional paper examination. In terms of the types of questions in the online examination system, we only set single choice, multiple choice and judgment questions in the system, set the passing score, set the time of the examination, and also count the number of people who have passed the examination, and provide the correct answer after the examination for students to think. There is also a progress display on the right side of the answer sheet. After each question was answered, the color of the question number on the answer sheet changed. There's also a timing system on the right.
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