题目1A. <img src="https://image.zhihuishu.com/zhs/question-import/formula/202206/ef986f1608c5465fb31bf167553b2aa7.png">B. <img src="https://image.zhihuishu.com/zhs/question-import/formula/202206/7856c850e16c42338992595ad5487ae3.png">C. <img src="https://image.zhihuishu.com/zhs/question-import/formula/202206/181be8ddece946c7aff0510a1b28a141.png">D. <img src="https://image.zhihuishu.com/zhs/question-import/formula/202206/47f2fd1102d94d419522ccea8a24baef.png">