可发生肺脓肿的是()
A.慢性阻塞性肺病
B.肺炎球菌性肺炎
C.局限性肺不张
D.肺栓塞
E.早期肺癌
参考答案:B
列车的速度大小对其受到的阻力无影响。
Internet shopping will ready _____ when people make sure that it is safe.[ ]
A. take off
B. take up
C. take over
D. take on