睾丸肿瘤主要临床表现
A．睾丸肿大，有沉重感B．睾丸疼痛C．血尿D．发热E．腹股沟淋巴结肿大
参考答案：A
在纵隔肿瘤中，比较常见的有（）
A.胸腺瘤
B.迷走甲状腺肿
C.淋巴瘤
D.神经源性肿瘤
E.畸胎瘤
A warehouse had a square floor with area 10,000 square meters. A rectangular addition was built along one entire side of the warehouse that increased the floor area by on-half as much as the original floor are-a. How many meters did the addition extend beyond the original building ？（）
A．10
B．20
C．50
D．200
E．500
