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问题 单项选择题

患者，女，22岁，原发闭经，身高140cm，有颈蹼及肘外翻，女性体型，第二性征不发育，外阴幼女型，子宫小，双侧卵巢未及。本例应考虑诊断为

A．Down征

B．Klinefelter征

C．Turner征

D．Stein-Leventhal征

E．Asherman征

答案

参考答案：C

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 A1/A2型题

下列不属于抗结核药应用原则的是（）

A.早期用药

B.联合用药

C.单一用药

D.足量用药

E.全程用药
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