问题
单项选择题
设区域D由-1≤x≤1,-1≤y≤1确定,则
的值可以通过( )求出。
A.只能先对x求积分
B.既可以先对x求积分也可以先对y求积分
C.只能先对y求积分
D.积分区域D决定该积分不能求出具体值
答案
参考答案:B
设区域D由-1≤x≤1,-1≤y≤1确定,则
的值可以通过( )求出。
A.只能先对x求积分
B.既可以先对x求积分也可以先对y求积分
C.只能先对y求积分
D.积分区域D决定该积分不能求出具体值
参考答案:B
补全短文。根据短文内容,从短文后的A-F选项中选出适当的选项补全对话。(共5小题,每小题1分;计5分) This is a picture of Tracy’s room. It’s a tidy room. A bed, a bookcase and a clock are near the window. 小题1: What’s under the chair? 小题2: Its name is Kitty. Tracy likes it very much. Some books and a dictionary are on the desk. 小题3: She is a good student. Look! 小题4: No, they aren’t hers. 小题5: He’s a student, too.
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