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问题 单项选择题 A1/A2型题

糖原合成中，葡萄糖的直接供体是（）

A.UDPG

B.ADPC

C.GDPC

D.1-磷酸葡萄糖

E.6-磷酸葡萄糖

答案

参考答案：A

解析：肝糖原合成中，UDP一葡萄糖(UDPG)为合成糖原的活性葡萄糖，作为葡萄糖供体。

单项选择题

We know a computer is a machine that processes data (stored in main memory) into information, under control of a stored program. We also know that, internally, a computer is a binary machine; thus the data and the program instruictions must be stored in binary form. Characters are represented in (71) . Numbers are stored as binary numbers, with each bit’s positional value significant. A computer’s main memory is divided into bytes, words or both (depending on the system), and each of these basic storage units is assigned an (72) . Using this address, the processor can read or write selected bytes or words.

The processor consists of a clock, an instruction control unit, an arithmetic and logic unit, and registers. Once a program is stored in main memory, the processor can begin to execute it. During (73) , the instruction control unit fetches an instruction from main memory; during (74) , the arithmetic and logic unit executes it. Precisely timed electronic pulses generated by the clock drive this basic (75)

（71）处填（）。

A．a binary code

B．words

C．registers

D．positional values
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单项选择题

在项目寿命周期成本分析中，为了权衡系统设置费中各项费用之间的关系，可采取的措施是( )。

A．进行节能设计以降低运行费用
B．采用整体结构以减少安装费用
C．培训操作人员以减少维修费用
D．改善设计材质以降低维修频度
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