AWOS 题库基础知识部分(选择题)(国外英文资料).doc

AWOS 题库基础知识部分(选择题)(国外英文资料) Automatic meteorological observation questions (multiple-choice part 178, 2007-3-23) Choose questions (1), fill in the blanks (2), judge questions (3), ask questions (5). Easy 1, medium 2, difficult 3. The binary numberandand is ________. A) B) C) D)B One One Sixteen hexadecimal number DC is converted to a binary number is ________. A) B) C) D)C One One X and Y into two logical variables, X Y logical or operation on the two logical variables is the result of ________. A) B) C) D)A One One The following statement about semiconductor, incorrect is ________. (A) a semiconductor is a material that guides electrical power between a conductor and an insulator B) silicon and germanium are the most commonly used semiconductor materials at present C) free electrons and holes occur in pairs (D) the resistivity is greatly improved when a trace impurity is added to the intrinsic semiconductor D One Two The following number number, the minimum number is ________. A) binary 101100 B) octal 54 C) decimal 44 D) sixteen hexadecimal 2A D One Two The following statement is correct ________. A) when the two variables are 0, the result is 1 B) the non - operation is a two - yuan operator (C) all logical operations are bitwise operations (D) 16H and 16Ds and operation, the result is 24H C One Two Is the use of a zener diode PN junction ________. (A) unidirectional conductivity B) reverse breakdown characteristic C) reverse characteristic D) ion diffusion B One Two Below on the amplifier to say, only ________ is certainly correct. A) amplifier has power amplification function B) amplifier has voltage amplification function C) the amplifier has a current amplification function D) the gain bandwidth product of the amplifier is constant A One Two The following statement, which one is wrong ________. (A) when