( ).
A、<img src="http://wximg.233.com/attached/image/20150818/20150818092959_2937.png" height="40" width="184" /> B、<img src="http://wximg.233.com/attached/image/20150818/20150818093008_6851.png" height="33" width="190" /> C、<img src="http://wximg.233.com/attached/image/20150818/20150818093023_0456.png" height="39" width="179" /> D、<img src="http://wximg.233.com/attached/image/20150818/20150818093033_0620.png" height="38" width="194" />
高等数学一