(单选题)8: They had become good friend () I wanted to introduce them to each other. A: before long B: long before C: after D: soon after ...
(单选题)2: The shop assistant helped him () the necklace. A: have B: dressing C: try on D: weared ...
(判断题)26: It was not until she learned her son had been admitted to the elementary school. A: 对 B: 错 ...
(单选题)20: If you want to be healthy, you’d better () too much chocolate. A: not to eat B: not eat C: not eating D: have not eaten ...
(单选题)14: I don’t think he will let out the secret. ()? A: will he B: won’t he C: don’t I D: do I ...
(单选题)8: Turn left at the first crossing, () you will see the cinema. A: 不填 B: and C: so D: But ...
(单选题)2: His spare time is usually spent () the old. A: helping B: help C: to help D: helps ...
(判断题)16: 无条件传送方式适用于工作速度非常快的外部设备的输入输出。 A: 对 B: 错 ...
(单选题)10: 关于RS-232C通信接口说法错误的是( )。 A: 采用正逻辑电平 B: 传输距离很短、传输速率低 C: 有电平偏移 D: 抗干扰能力差 ...
(单选题)4: MCS-51的串行口工作方式中最适合多机通信的是( )。 A: 方式0 B: 方式1 C: 方式2 D: 方式3 ...