题目1单选题
<img src="https://tihai-oss-cloud.itihey.com/img/e3fb61eefac5a7490f6959a3e9244b2e.png">用定积分表示为( )A. <img src="https://tihai-oss-cloud.itihey.com/img/743bb84e64186e4a110bc23420d4e161.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/b36ddeae94fdec16f6788dd4e18a59ab.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/22c9276b8c692af6b291339db5556541.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/17cc13925b670a924e8a82478634ca86.png">