下述原发性支气管肺癌临床表现中,最常见的早期症状是()
A.咳嗽
B.咯血
C.胸痛
D.呼吸困难
E.发热
参考答案:A
地高辛的半衰期是36h,估计每日给药1次,达到稳态血药浓度的时间应该是:
A.24hB.6~7dC.48hD.36hE.2d
The Diaoyu islands have been part of China’s territory since ancient times, ______ as important fishing grounds of Taiwan.
A.served
B.to serve
C.serving
D.having served