费用和效益的识别应坚持增量分析、考虑关联效果、以本国居民作为分析对象和( )的原则。
A.取得政府支持
B.防止漏算
C.带动关联产业
D.剔除转移支付
参考答案:D
His uncle went abroad in 2010, and_____ since.[ ]
A.has not been heard of
B.had not been heard of
C.had not heard of
D.has not heard of
常用轮椅有哪些?