AWOS 题库基础知识部分(选择题)（国外英文资料）.docVIP

AWOS 题库基础知识部分(选择题)（国外英文资料） Item: the weather automatic observation test (the choice of major section 178 is 2007-3-23) Choice (1), fill-in-the-blanks (2), judgment (3), qa (5). Easy 1, middle 2, hard 3. The sum of the binary numberandis... A)B)C)D)B one one To convert the hexadecimal number DC to the binary number is ________. A)B)D)C one one X and Y are two logical variables, X = Y = and the logical or operational result of these two logical variables is... A) 111111011 B) 1011111111 C)a. one one In the case of semiconductors, the following is not true. A) A semiconductor is A material that instructs electrical capabilities in between conductors and insulators B) silicon and germanium are the most commonly used semiconductor materials C) free electrons and holes appear in pairs D) the resistivity is greatly improved after the inclusion of trace impurities in the semiconductor D one 2 The smallest number in the following list of Numbers is ________. A) binary 101,100 B) octal 44 C) hexadecimal 2A D one 2 The following statement is correct in ________. A) the two variables are 0 when both variables are 0, and the result is 1 B) the non- operation is a binary operator C) all logical operations are performed by bit D) 16H and 16D and are 24H C one 2 The voltage stabilizer takes advantage of the PN junction. The diffusibility of the reverse characteristic D) ions B one 2 In the following statement on the amplifier, only ________ is definitely correct. A) amplifiers have power amplification function B) amplifiers with voltage amplification C) amplifier has a current amplification function D) amplification of the amplifier a. one 2 Which of the following statements is false? A) when someone is electrocuted, it should be cut off first B) the more humid the electrical equipment environment, the lower the use of safe voltage C) in the same power supply syst