OTDR主要技术指标中的反射率精度为（）。
A.±2dB
B.±4dB
C.±6dB
D.±8dB
参考答案：A
--- What did he say? ---- He said he ________ the sentence in his own words.
A．was considering to explain
B．considered how to explaining
C．would consider to explain
D．was considering explaining
血清AFP阳性不会出现的一种情况是：（）
A.急性黄疸性肝炎
B.原发性肝癌
C.原发性胆汁性肝硬化
D.睾丸癌
E.妊娠
