【简答题】在实际设备更新方案必选时,应遵循的原则包括( )。
【单选题】We thought there were 35 students in the dining hall, ______, in fact, there were 40. [ ]
【单选题】While we were listening to the speech attentively, a voice ________ to announce the result of the election
【单选题】“中国青年旅行社”的海南双飞六日游旅游项目在暑假定价为1050元/人,春节期间定价为1850元/人,这种定价方法属于( )。
【简答题】汽车转向灯的闪烁是通过 来实现的。其主要有 电热式、 和 三种类型。
【单选题】下列各项中不属于发动机爆震故障现象的是( )。
A.
发动机启动后即有振抖现象,转速越高,振抖越激烈
B.
发动机发出无节奏或低沉不清晰的敲击声,并且冒黑烟
C.
发动机发出清晰而有节奏的金属敲击声,急加速时声响更大,排气管冒黑烟
【单选题】While we were listening to the speech attentively, a voice _____ to announce the result of the election.
【单选题】We _______ our hands while they were singing on the stage. [ ]