课程名称︰计算机概论 课程性质︰必修 课程教师︰黄鼎伟 开课学院：电资学院 开课系所︰电机系一年级 考试日期（年月日）︰2009 4/15 考试时限（分钟）：两节课 110分钟 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 试卷防作弊分ABC卷，以下为卷A Computer Science Midterm Examination for Chapter 1-4 and 5.1-5.3(Quiz A) Language description table Op-code Oprand Description 1 RXY LOAD ... 2 RXY LOAD ... 3 RXY STORE 4 0RS MOVE 5 RST ADD 6 RST ADD 7 RST OR 8 RST AND 9 RST EXCLUSIVE OR A R0X ROTATE B RXY JUMP C 000 HALT (注:以上表格同课本，供作答参考用，Description太多故这里我省略了) The following table shows a portion of a machine's memory containing a program written in the language described in the language description table. Answer the question below that the machine is started with its program counter containing 00. address content address content 00 20 07 12 01 02 08 B2 02 21 09 0C 03 01 0A B0 04 22 0B 06 05 00 0C CO 06 52 0D 00 1.What bit pattern will be in register 2 when the machine halt? A.01 B.02 C.03 D.04 2.How many times will the instruction at address 06 be executed before the machine halts? A.1 B.2 C.3 D.4 3.Suppose register E and F contained AA and CC, respectively. What bit pattern would be in register D after executing 7DEF (see language description table)? A.EE B.88 C.66 D.CC 4.The following is a routine encoded in the machine language described in the language description table. Explain(in a single sentence) what the routine does.(Explain what the entire routine does as a unit rather than reciting what each instruction does.) 210F 12A0 8212 32A0 A. It place 0s in the four least significant bits of memory cell A0 without disturbing the other four bits. B. It place 1s in the four least significant bits of memory cell A0 without disturbing the other four bits. C. It place 0s in the four most significant bits of memory cell A0 without disturbing the other four bits. D. It place 1s in the four most significant bits of memory cell A0 without disturbing the other four bits. 5.In which of the following locations is information most readily available for manipulation by the CPU? A. General-purpose registers B. Main memory C. Mass storage 6.Which of the following is not a means of repeating a block of instructions? A.Pretest loop B.Posttest loop C.Recursion D.Assignment statement 7.Which of the following instructions falls in the category of data transfer instructions? A.LOAD B.AND C.ROTATE D.JUMP 8.What value is represented by the bit pattern 01011100 when interpreted using floating-point format in which the most signficant bit is the sign bit, the next three bits represent the exponent field in excess notation, and the last four bits represent the mantissa? A.-1 1/2 B.3/8 C.-3/8 D.1 1/2 9.Which of the following values cannot be stored accurately using a floating-point format in which the most significant bit is the sign bit, the next three bits represent the exponent field in excess notation, and the last four bits represent the mantissa? A.2 1/2 B.3/16 C.7 D.6 1/4 10.The bit pattern 1011010010011111 can be represented in hexadecimal notation as A.795C B.A38D C.D56F D.B49F 11.Which of the following systems is least efficient when encoding numeric values? A.Two's complement notation B.Excess notation C.ASCII D.Floating-point notation 12.How many different symbols can be encoded using Unicode? A.256 B.4,096 C.65,536 D.1,046,476 13.The bus in a computer is an example of which form of communication? A.Serial B.Parallel C.Neither A nor B 待续... -- 18166 4/01 - □ (再吵通通送去加拿大...by 希恰) ◢ ◣▁◢◣ ˙ 18167 4/01 - □ (本文已被删除) ◤◢Cc◢◥◣ ◢ ˙ 18168 4/01 - □ (本文已被删除) ◤◤▁◤ ◥ ˙ 18169 4/01 - □ (本文已被删除) ψLapisLazuri ◤◣ ◢ ˙ 18170 4/01 - □ (本文已被删除) ...(( ◢∕ ▼ >▼ ˙ 18171 4/01 - □ (本文____________▁▁▁▁▂▂▍▃▆▲ ▲◤ ˙ --

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