题目内容
空间四边形对角线互相垂直的充要条件是对边平方和相等。
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一组向量如果含有零向量，则这组向量必线性无关。
两个非零向量共线的充要条件是对应坐标成比例。
如果两非零向量互相垂直，则其中一个向量在另一个向量上的射影为零。
Complete the sentences with words below. Change the form where necessary.peerdeliberationpreferenceinitialbrillianceminimal1. Discovering what you are about and what you really want is the _____________ step to finding a satisfying career.2. My decision on which university I should choose was made after much _______________.3. __________ pressure is the strong influence that people of our age have on us. It affects people of all ages, in various aspects of life.4. She is grateful that her parents discovered her ___________ as a musician.5. In many industries it is of interest to understand a customer’s ____________ and traits so as to better serve the customer.6. Though with knowledge of how to write, learners will find it difficult to improve their writing if they put in __________ effort and take little practice.
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