肿块坚硬,且在脓液中可找到硫磺颗粒的疾病是()
A.胸壁骨或软骨良性肿瘤
B.胸壁骨或软骨恶性肿瘤
C.胸壁放线菌病
D.胸壁结核
E.阿米巴脓胸
参考答案:C
Children of all ages can learn a lot of things, such as road awareness and street safety skills, ____ they walk
without knowing.
A. unless
B. as
C. as though
D. as soon as
在经济分析中,往往需要采取特殊的方法测定这些产品或服务的影子价格,不包括( )。
A.成本分解法 B.消费者支付意愿法C.德尔菲法 D.机会成本法