原发性肝癌肝内播散的最主要途径是()A．经淋巴管 B．经肝静脉 C．经肝动脉 D．经

为什么要保护环境?是因为(   )

A．自然界的存在和发展是客观的

B．社会的存在和发展是客观的

C．要按照客观规律办事，违背客观规律要受到规律的惩罚

D．要充分发挥人的主观能动性

现行我国计划免疫工作（儿童基础免疫）规定接种的疫苗是（）。

A.卡介苗、麻疹疫苗、脊髓灰质炎疫苗、百日咳疫苗、流行性脑脊髓膜炎疫苗

B.麻疹疫苗、卡介苗、百白破、乙肝疫苗、流行性乙型脑炎疫苗

C.乙肝疫苗、卡介苗、麻疹疫苗、流行性乙型脑炎疫苗、流行性腮腺炎疫苗

D.卡介苗、百白破、麻疹疫苗、脊髓灰质炎疫苗、乙肝疫苗

E.卡介苗、百白破、乙肝疫苗、脊髓灰质炎疫苗、流行性腮腺炎疫苗

4岁女孩。低热，咽痛，1天后全身出现弥漫性斑丘疹，颈后和枕部淋巴结明显肿大和轻度触痛，第4天皮疹消失。本例最可能的诊断是

A．风疹
B．麻疹
C．玫瑰疹
D．感染性红斑
E．多形性红斑

Developing reliable software on time and within (1) represents a difficult endeavor for many organizations.
Usually business solutions have three main aspects:people, (2) , and technology.The main reason for failing software projects has little to do with technology and tools, and much to do with lack of process (3) . Experience has shown that introducing new technology and tools in an immature or undisciplined environment is likely to increase the chaos. CASE tools are not enough. "A fool with a tool is still a fool!"
Structured method was the first wave of the software industry. This was the beginning of transforming software development from a " (4) industry" to mass production.Software process movement if the second wave in the software industry.The process maturity movement prepares the way for the third wave of the software industry: "software industrialization". Software development will become like an assembly and manufacturing process. A critical enabling factor is a disciplined software engineering process with predictable quality, (5) and functionality.

A. college B. family C. workshop D. cottage

当神经纤维受到刺激产生兴奋时，关于细胞膜内外的电位的叙述正确的是（）

A.外正内负

B.外负内正

C.外正内正

D.外负内负