使用成本效益分析法对项目进行分析时,需要遵循(),(),()原则
参考答案:最有效原则;最经济原则;费用效益比
下列卵巢囊性病变影像,哪项不对()。
A.滤泡囊肿多<3cm
B.CT能准确区分浆性、黏液性囊腺瘤
C.单纯囊肿多为单房性
D.单纯囊肿多<5cm
E.多囊卵巢病,双侧卵巢常同时受累
I couldn't get through the door because there was a big box _____. [ ]
A. by the way
B. on the way
C. out of the way
D. in the way