【单选题】
The President is directly voted into office by .
A. A. all citizens of America
B. B. the citizens over 18 years old
C. C. electors elected by the voters
D. D. the senators and representatives
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答案
C
解析
暂无解析
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The Supreme Court is composed of justices.
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The terms for a Senator and Representative are and years respectively.
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According to the Constitution, a candidate for President must be .
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The following except are all powers of the President.
A. A. vetoing any bills passed by Congress
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C. C. making laws
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All the following except cannot make legislative proposal.
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The following except are guaranteed in the Bill of Rights.
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The Bill of Rights .
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The U. S. Constitution came into effect in .
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President applied New Deal to deal with the problems of the Great Depression.
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A. A. neutrality
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Abraham Lincoln issued to grant freedom to all slaves.
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is located on the U. S. –Canadian border between Lake Erie and Lake Ontario.
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63、输入端的TTL或非门,在逻辑电路中使用时,其中有5个输入端是多余的,对多余的输入端应作如下处理,正确的方法有___。
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64、高压电器设备上的缺陷分为___
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65、下列说法正确的为___。
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66、将尖顶波变换成与之对应的等宽的脉冲应采用___。
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67、555集成定时器由___等部分组成。
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68、一个十位二进制加法计数器,在0.002秒内选通,假定初始状态为0,若计数脉冲频率为250KHZ,在选通脉冲终止时,计数器的输入脉冲为()个,计数终止时,计数器的输出状态为___。
A. 250个
B. 500个
C. 750个
D. 0111110100
E. 111110100
【多选题】
69、指出下列触发器中,哪些触发器具有翻转的逻辑功能___。
A. JK触发器
B. RS触发器
C. T’触发器
D. D触发器
E. T触发器
【多选题】
70、荧光数码管的特点是___。
A. 工作电压低,电流小
B. 字形清晰悦目
C. 运行稳定可靠,视距较大
D. 寿命长
E. 响应速度快
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71、半导体数码显示器的特点是___。
A. 运行稳定可靠,视距较大
B. 数字清晰悦目
C. 工作电压低,体积小
D. 寿命长
E. 响应速度快,运行可靠
【多选题】
72、在异步计数器中,计数从0计到144时,需要多少个触发器___。
A. 4个
B. 5个
C. 6个
D. 23个
E. 2×4个
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73、具有12个触发器个数的二进制异步计数器,它们具有以下哪几种状态___
A. 256种
B. 4096种
C. 1024×4种
D. 6536种
E. 212种
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74、与非门其逻辑功能的特点是___。
A. 当输入全为1,输出为0
B. 只要输入有0,输出为l
C. 只有输入全为O,输出为1
D. 只要输入有1,输出为0
【多选题】
75、或非门其逻辑功能的特点是___。
A. 当输入全为1,输出为0
B. 只要输入有0,输出为l
C. 只有输入全为0,输出为l
D. 只要输入有1,输出为0
【多选题】
76、KC04集成移相触发器由___等环节组成。
A. 同步信号
B. 锯齿波形成
C. 移相控制
D. 脉冲形成
E. 功率放大
【多选题】
77、目前较大功率晶闸管的触发电路有以下___形式。
A. 单结晶体管触发器
B. 程控单结晶闸管触发器
C. 同步信号为正弦波触发器
D. 同步信号为锯齿波触发器
E. KC系列集成触发器
【多选题】
78、造成晶闸管误触发的主要原因有___。
A. 触发器信号不同步
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C. 控制极与阴极间存在磁场干扰
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【多选题】
79、常见大功率可控整流电路接线形式有___。
A. 带平衡电抗器的双反星形
B. 不带平衡电抗器的双反星形
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D. 大功率三相半控整流
E. 十二相整流电路
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80、控制角α=0°整流输出功率平均电压为2、34U2Φ,电路有___。
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81、整流电路最大导通角为2π/3的有___电路。
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【多选题】
82、可以逆变的整流电路有___。
A. 三相全控桥
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【多选题】
83、通常用的电阻性负载有___。
A. 电炉
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【多选题】
84、晶闸管可控整流电路通常接有三种不同电性负载,它们是___。
A. 电阻性
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C. 反电势
D. 电容性
【多选题】
85、三相可控整流电路的基本类型有___。
A. 三相全控桥
B. 单相全控桥
C. 三相半控桥
D. 单相半控桥
E. 三相半波
【多选题】
86、集成电压跟随器的条件是___。
A. AF=1
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【多选题】
87、运算放大器目前应用很广泛的实例有___。
A. 恒压源和恒流源
B. 逆变
C. 电压比较器
D. 锯齿波发生器
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【多选题】
88、集成运放的保护有___。
A. 电源接反
B. 输入过压
C. 输出短路
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【多选题】
89、一个理想运放应具备的条件是___。
A. RI→∞
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【多选题】
90、集成反相器的条件是___。
A. AF=-1
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【多选题】
91、集成运算放大器若输入电压过高,会对输入级___。
A. 造成损坏
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【多选题】
92、判断理想运放是否工作在线性区方法是___。
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C. 看是否开环
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【多选题】
93、反相比例运算电路的重要特点是___。
A. 虚断
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【多选题】
94、理想运放工作在线性区时的特点是___。
A. 差模输入电压U+-U-=0
B. U+-U-=∞
C. U+-U-=UI
D. U+=U-