病原体导致疾病严重程度的能力被称为（）
A.致病力
B.侵袭力
C.传染性
D.毒力
E.抗原性
参考答案：D
男，65岁，间歇性全程无痛肉眼血尿1个月。膀胱镜检发现左输尿管口喷血。IVP示左肾盂充盈缺损。
应采取何种治疗措施（）
A.肾癌根治术
B.肾造瘘
C.肾盂癌根治术
D.肾囊肿去顶术
E.以上都不对
Some necessary equipment as well as food and clothes________sent to the disasterhit area since
the powerful earthquake occurred. [ ]
A. has been
B. have been
C. is being
D. are being
