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【简答题】
我们知道，高温煅烧石灰石（主要成份是碳酸钙）可制得生石灰（即氧化钙）和二氧化碳。为了分析产品的纯度，同学取石灰石样品22g，充分煅烧后称得剩余固体的质量为13.2g（提示：假定杂质不反应）。计算： （1）生成二氧化碳的质量是多少克？这些二氧化碳在标准状况下的体积是多少升？（标准状况下CO 2 的密度1.977g/L） （2）制得生石灰的质量是多少克？其产品的纯度是多少？
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举一反三
【单选题】'To place a suspect at the scene of a crime' at the end of the first paragraph means that the FBI ______.
A.
has been able to prove a suspect guilty
B.
will lead a suspect to the spot of a crime
C.
were at the scene with the suspect
D.
caught the suspect on the spot
【单选题】The fingerprints left at the scene of the crime finally______the identity of the criminal.
A.
established
B.
affirmed
C.
convinced
D.
reinforced
【单选题】Several witnesses ________ that they saw the defendant at the scene of the crime.
A.
convict
B.
confirm
C.
retort
D.
testify
【简答题】用xmind软件,将电动车窗与电动后视镜的功能与结构部分内容做成思维导图文件,以自己的姓名命名后上传附件。
【单选题】Soldiers stood next to a police truck, looking at the crime scene _____ a woman was gunned down in a poor neighborhood of the border city of Iran on October 18, 2009. [ ]
A.
that
B.
which
C.
where
D.
why
【单选题】The first important thing at the crime scene is to __________.
A.
interrogate the suspect
B.
interview the witness
C.
protect and block the scene
D.
gather evidence
【单选题】The worker witnessed ________ seen the accused near the scene of the crime. [ ]
A.
to have
B.
to having
C.
for having
D.
having
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