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【单选题】
电路如图所示,已知 U S1 = 8V , U S2 = 7V , R 1 = 3Ω , R 2 = 2Ω 。 a 、 b 两点间的电压 U ab 为 ( ) 。
A.
10.8V
B.
10.2V
C.
9.6V
D.
9 .2V
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举一反三
【单选题】She will never forget the day ______ she joined the party.
A.
when
B.
which
C.
that
D.
where
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【判断题】本实验中,标准溶液及待测液必须用移液管移取,其他试剂也尽可能用移液管移取。
A.
正确
B.
错误
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【单选题】she joined the company only a year ago,  she's already been promoted twice. [     ]
A.
Because
B.
Although
C.
Now that
D.
When
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【单选题】According to Rowena Baker, one problem which Smithson's faced when she joined was that
A.
the number of people using the store was falling slowly.
B.
its competitors offered a more specialised range of products.
C.
the store's prices were set at the wrong level.
D.
customers were unhappy with the service provided.
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【单选题】According to Bowena Baker， one problem which Smithson‘s faced when she joined was that_______ 查看材料
A.
the number of people using the store was falling slowly
B.
its competitors offered a more specialized range of products
C.
the store's prices were set at the wrong level
D.
customers were unhappy with the service provided
查看完整题目与答案
【单选题】国际空间站美国舱段尿液处理装置的核心部件是？
A.
蒸汽压缩蒸馏设备
B.
热电集成膜蒸发设备
C.
气相催化除氨设备
D.
冷冻压缩尿液处理设备
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【单选题】碘化物造影须做过敏试验,应在何时进行( )
A.
造影前1~2h内
B.
造影前6~12h
C.
造影前12~24h
D.
造影前24~48h
E.
造影前48~72h
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【单选题】用减压蒸馏来提纯化合物时,下列说法不正确的是 ( )
A.
减压蒸馏主要用于受热易分解或氧化、高沸点等物质的提纯。
B.
减压蒸馏的沸点不可预测，我们只能接收不同沸点的产物，然后根据量来判断产物。
C.
进行减压蒸馏时，可以不需要装温度计在蒸馏头上。
D.
减压蒸馏的沸点不是唯一的，全班同学可以不一样。
查看完整题目与答案
【单选题】According to Rowena Baker, one problem which Smithson's faced when she joined was that
A.
the number of people using the store was falling slowl
B.
its competitors offered a more specialised range of product
C.
the store's prices were set at the wrong leve
D.
customers were unhappy with the service provide
查看完整题目与答案
【单选题】碘化物造影须做过敏试验,应在何时进行()
A.
造影前1~2h内
B.
造影前6~12h2
C.
造影前12~24h
D.
造影前24~48h
E.
造影前48~72h分钟
查看完整题目与答案
相关题目：
【单选题】She will never forget the day ______ she joined the party.
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when
B.
which
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D.
where
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【判断题】本实验中,标准溶液及待测液必须用移液管移取,其他试剂也尽可能用移液管移取。
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【单选题】According to Rowena Baker, one problem which Smithson's faced when she joined was that
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the number of people using the store was falling slowly.
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【单选题】According to Bowena Baker， one problem which Smithson‘s faced when she joined was that_______ 查看材料
A.
the number of people using the store was falling slowly
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its competitors offered a more specialized range of products
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customers were unhappy with the service provided
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【单选题】国际空间站美国舱段尿液处理装置的核心部件是？
A.
蒸汽压缩蒸馏设备
B.
热电集成膜蒸发设备
C.
气相催化除氨设备
D.
冷冻压缩尿液处理设备
查看完整题目与答案
【单选题】碘化物造影须做过敏试验,应在何时进行( )
A.
造影前1~2h内
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C.
造影前12~24h
D.
造影前24~48h
E.
造影前48~72h
查看完整题目与答案
【单选题】用减压蒸馏来提纯化合物时,下列说法不正确的是 ( )
A.
减压蒸馏主要用于受热易分解或氧化、高沸点等物质的提纯。
B.
减压蒸馏的沸点不可预测，我们只能接收不同沸点的产物，然后根据量来判断产物。
C.
进行减压蒸馏时，可以不需要装温度计在蒸馏头上。
D.
减压蒸馏的沸点不是唯一的，全班同学可以不一样。
查看完整题目与答案
【单选题】According to Rowena Baker, one problem which Smithson's faced when she joined was that
A.
the number of people using the store was falling slowl
B.
its competitors offered a more specialised range of product
C.
the store's prices were set at the wrong leve
D.
customers were unhappy with the service provide
查看完整题目与答案
【单选题】碘化物造影须做过敏试验,应在何时进行()
A.
造影前1~2h内
B.
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C.
造影前12~24h
D.
造影前24~48h
E.
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查看完整题目与答案