计算机的核心部件是( )。 A．CPU B．内存 C．硬盘 D．主板

下图A、B、C、D分别表示某雄性哺乳动物（2n）在有性生殖过程中不同时期的细胞， a、b、c、d表示某四种结构或物质在不同时期的数量变化。

(1)根据a、b、c、d在不同时期的数量变化规律，判断a、b分别指什么结构或物质：a：____________；b：_____________。

(2)基因分离定律主要在图中的_______________时期完成的（用字母表示）

(3)可能不含Y染色体的细胞是____________（用字母表示）

(4)下图所示细胞属于上图的____________时期，若该生物是人类那么在研究人类基因组计划测定的染色体为_________上DNA的碱基序列。这些DNA分子大约有31.6亿个碱基对，其中构成基因的碱基数占碱基总数的比例不超过2%，这说明__________________。

Developing reliable software on time and within （） represents a difficult endeavor for many organizations. Usually business solutions have three main aspects: people, （） , 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 （） . 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 “ （） industry” to mass production. Software process movement is 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, （） and functionality.

（） industry” to mass production

A．college

B． family

C．workshop

D．cottage

用卡车将少量（1-2盘）光缆运至敷设现场时，可用“千斤”支架光缆，但盘离车箱底板不超过（）cm。

A.10

B.8

C.5

D.3

( )是船舶大副编制船舶积载图的主要依据。

A．装货联单

B．装货清单

C．载货清单

D．码头收据

预激综合征合并快速心房颤动（）

A．地尔硫（硫氮卓酮） 

B．洋地黄 

C．阿托晶 

D．利多卡因 

E．胺碘酮