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【单选题】
关于pH计的使用错误的是A.
pH计使用前开机预热
B.
pH计使用前标准缓冲溶液进行标定。
C.
pH计可用于粗略测定溶液pH值
D.
测不同溶液的pH值时，必须用蒸馏水清洗电极并用滤纸吸干
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【单选题】旅客有可以申请候补购票的情况,下列不属于的是( )。
A.
有旅客购票后退票
B.
原定担任航班飞行的机型改变，座位增加
C.
航班保留的控制座位没有使用
D.
航班座位供过于求
【简答题】YoYo Ma was born in 1955 to Chinese parents living in Paris. He began to study the cello with his father at four. A year later, when he was 36 years old, he gave his first concert. The family soon mov...
【单选题】waht can we infer from the clip?
A.
many people chose not to celebrate Valentine's Day because it is quite commercialised
B.
the electronic ways become more popular than those traditional ways of celebration
C.
many people still think it's always good to give each other presents on Valentine's Day
D.
many people think that Valentine's Day has lost its original significance
【单选题】票务员工作行为规范说法正确的是
A.
在接受旅客的有效证件和订票单时可以单手递送
B.
若有看不清或者不明白的地方,直接询问旅客即可
C.
将客票交与旅客时,直接给旅客就行,不用说明相关事宜
D.
将客票交与旅客时,还应请旅客看清客票上的有关内容,必要时对重点内容可以标注
【简答题】(单选)理论形成的时代主题是()
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