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【多选题】
用红外分光光度法鉴别药品时,应注意的操作事项包括( )A.
红外室应保持15 ~30 ℃；，相对湿度小于65%
B.
用于压片的溴化钾或氯化钾应事先干燥
C.
单光束红外仪应先进行空白背景扫描，再扫描供试品
D.
压片法制成的片厚度一般不超过0.5μm
E.
供试品研磨后的颗粒粒度以2~5 μm为宜
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举一反三
【单选题】Questions 16 and 18 will be based on the following news item.---18
A.
How listeners in different cultures show respect.
B.
How speakers can win approval from the audience.
C.
How speakers can misunderstand the audience.
D.
How different Western and Eastern art forms are.
【单选题】Questions 16 and 18 will be based on the following passage.---16
A.
About 4,000 years ago.
B.
About 3,000 years ago.
C.
About 2,000 years ago.
D.
About 1,000 years ago.
【单选题】Questions 16 and 18 will be based on the following news item.---18
A.
Plotting to kill the president.
B.
Plotting to kill the Vice-president.
C.
Plotting to bombard the capital city.
D.
Plotting to overthrow the government.
【单选题】____ will be appreciated.
A.
You reply our letter early
B.
You reply to our letter early
C.
Your early reply our letter
D.
Your early reply to our letter
【单选题】We are waiting ______ your reply ______ our letter.
A.
----， of
B.
for， to
C.
---- of
D.
---，----A35
【单选题】Questions 16 and 18 will be based on the following news item.---16
A.
The uniqueness of Japanese art.
B.
Some features of Japanese culture.
C.
Characteristics of Japanese artists.
D.
The art of Japanese brush painting.
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