下列肺癌中适宜手术的是()
A.声音嘶哑
B.血性胸腔积液
C.上腔静脉阻塞
D.肺性骨关节病
E.锁骨上淋巴结活检有肿瘤细胞
参考答案:D
To get here in time, they came _________ all the way. [ ]
A. running
B. run
C. ran
D. to run
电动机的保护主要有哪些?