Because different versions of the exam use different questions, the level of difficulty will vary slightly from test to test.
因为不同版本的试卷使用不同的问题，所以每次考试的难易程度便各不相同。
It can automatically find and organize a certain number of test questions in various types with different degrees of difficulty in certain scope in the database to form a reasonable test paper.
本系统可以从试题库中自动的查找和组织出一些不同类型、不同难度、不同章节范围内的试题来组成一份合理的试卷。
Not only does the test mark you on the number of questions answered but also on the difficulty.
测试打分不仅看你答题的数量还包括难度。
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