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【单选题】
宁波设市舶司始于A.
唐
B.
北宋
C.
元
D.
明
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【简答题】Choose the right answers to the given questions. 为下列问句选择正确的答案。 ( ) 1. Where is your cat? ( ) 2. Are these cars or jeeps? ( ) 3. What colour is it? ( ) 4. How tall are you? ( ) 5. N...
【简答题】Choose the right answers to the given questions. 为下列问句选择正确的答案。 ( )1. What colour is it? ( )2. Where is Jenny? ( )3. What time is it? ( )4. How is the weather? ( )5. How are you? A....
【单选题】Choose the right answers to the given questions. 为下列问句选择正确的答案。 ( ) 1. How's the weather today? ( ) 2. What is the fifth month of the year? ( ) 3. What's the date? ( ) 4. When is lunch?...
A.
May.
B.
It's Saturday.
C.
It's 12:30.
D.
It's September 10.
E.
It's warm and sunny.
【多选题】水样中常含有少量固体物质形成悬浮物，影响容量和比色测定，水样组成复杂，某些组分会干扰待测组分测定；待测组分含量很低，一般只有ppb级或更低，直接测定很困难；故水样测定前通常要经过预处理，预处理的方法有下列哪些
A.
悬浮物的分离
B.
水样消解
C.
放置
D.
待测组分的浓缩和分离
E.
加热
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