原型法开发过程的主要步骤包括( )A．识别基本需求 B．评价修改原型 C．系统维

一般对于三相—壳型GIS大都采用( )。

A．钢制外壳

B．铝合金外壳

C．铜合金外壳

D．钛合金外壳

Now that she is out of a job, Lucy ____ going back to school,   but she hasn't decided yet.      [ ]

A. had considered    

B. has been considering   

C. considered    

D. is going to consider

男性，84岁。长期卧床及便秘，1天前出现腹痛，不排气排便，该患者最可能的诊断为（）

A.腹膜炎

B.肠梗阻

C.结肠炎

D.肝脓肿

E.肠结核

In English culture, there are four interpersonal distance zones: the intimate zone, the casual-personal zone, the socio-consultative zone and the public zone. Please decide which zone matches with each of the following situations: (1) conversations with relatives;(2)business discussion; (3) public lectures; (4) staying with spouses and kids

有一名患者胸部长了一个肿瘤，医院X光检查结果呈阳性。据统计，胸部肿瘤为良性的概率为99%。对良性肿瘤，X光检查的正确率(呈阴性的概率)为90%；对恶性肿瘤，x光检查的正确率(呈阳性的概率)为80%。因此，可推算出该患者患恶性肿瘤的概率是 (25) 。

A．0.8%
B．7.5%
C．80%
D．75%