油船按用途可以分为原油船和（）船。
（A）汽油
（B）轻油
（C）润滑油
（D）成品油
参考答案：D
Although medical science________control over several dangerous diseases，what worries us is that some of them are recurrent.
A．achieved
B．has achieved
C．will achieve
D．had achieved
同时出现双室增大的疾病是
A．二尖瓣狭窄B．心包炎C．室间隔缺损D．主动脉瓣狭窄E．三尖瓣关闭不全
