皮皮学，免费搜题
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【单选题】
“绿色化学”是当今社会提出的一个新概念。在“绿色化学”工艺中，理想状态是反应中原子全部转化为欲制得产物，即原子利用率100%。利用以下各种化学反应类型的合成过程最符合绿色化学的是A.
取代反应
B.
水解反应
C.
加成反应
D.
消去反应
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】It can be inferred from the text that______.
A.
once customers' misfortunes happen, they can get compensation from companies
B.
once customers' misfortunes happen, they can't get compensation from companies
C.
according to current law, the information on the products was provided for the benefits of customers
D.
according to current law, the information on the products was provided as protection against legal liability
【单选题】客户采购了一台路由器，如果此路由器性能指标为平均无故障工作时间MTBF>Y148年，平均维修时间MTTR
A.
99.9%
B.
99.99%
C.
99.999%
D.
99.9999%
【单选题】听力原文： I grew up in a small town. My father raised chickens and ran a construction company. When I was 10 years old, my dad gave me the responsibility of feeding chickens and cleaning up the stable. He...
A.
At the age of 10.
B.
At tile age of 22.
C.
When he was known as a singing cook.
D.
After he found a job in New York.
【单选题】客户采购了一台路由器,如果此路由器性能指标为平均无故障工作时间MTBF>Y14 8年,平均维修时间MTTR
A.
99.9%
B.
99.99%
C.
99.999%
D.
99.9999%
【简答题】密封件材料应具备哪些性能?哪些材料可以作为O形密封圈的制作材料?
【单选题】听力原文： I grew up in a small town. My father raised chickens and ran a construction company. I was barely 10 years old when my dad gave me the responsibility of feeding the chickens and cleaning up the ...
A.
Because he was a cook at a country-music club.
B.
Because he performed for guests while he worked as a cook.
C.
Because he often sang while cooking.
D.
Because he liked singing better than cooking.
【单选题】听力原文： I grew up in a small town. My father raised chickens and ran a construction company. When I was 10 years old, my dad gave me the responsibility of feeding chickens and cleaning up the stable. He...
A.
At the age of 10.
B.
At the age of 22.
C.
When he was known as a singing cook.
D.
After he found a job in New York.
【单选题】客户采购了一台路由器设备,如果此路由器性能指标为平均无故障工作时间MTBFW5000,平均维修时间MTTRSOQ 5则此路由器可靠性为:
A.
99.9%
B.
99.99%
C.
99.999%
D.
99.9999%
相关题目：
【单选题】客户采购了一台路由器,如果此路由器性能指标为平均无故障工作时间MTBF>Y14 8年,平均维修时间MTTR
A.
99.9%
B.
99.99%
C.
99.999%
D.
99.9999%