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【单选题】
下列操作中,不正确的是( )A.
拿比色皿时用手捏住比色皿的面，切勿触及透光面
B.
比色皿外壁的液体要用细而软的吸水纸吸干，不能用手擦拭，以保护透光面
C.
在测试一系列溶液的吸光度时，按从稀到浓的顺序进行以减小误差
D.
被测液要倒满比色皿，以保证光路完全通过溶液
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【单选题】What are not the different types of tour guide in the tourism industry?
A.
National guide.
B.
Tour leader.
C.
Local guide.
D.
Travel operator.
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A.
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B.
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C.
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D.
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【单选题】Why a tour guide should introduce the tour itinerary? Which one is the wrong answer?
A.
Because it is the necessity of service tenet of a tour guide.
B.
Because the tourists always want to know the schedule and itinerary urgently.
C.
Because the tourists wants the tour guide offer some recommends for them.
D.
Because the tourists wants to travel by themselves.
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