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【单选题】
OSI参考模型有几层？A.
5
B.
6
C.
7
D.
8
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反馈参考答案：
举一反三
【单选题】The two parties that have held power in Britain since 1945 are ___________ .
A.
the Democratic Party and the Republican Party
B.
the Conservative Party and the Labor Party
C.
the Labor Party and the Social Democratic Party
D.
the Labor Party and the Democratic Party
【单选题】Regarding Chemiosmotic hypothesis , which one is wrong?
A.
H + is pumped in matrix from intermembrane space
B.
Electrochemical gradient is established across the inner membrane
C.
Protons flowing back drives ATP generation
D.
The role of proton pump is to store energy
【简答题】阅读理解。 Beijing had its biggest snowfall since 1951. Britain is suffering through its longest cold snap (寒潮) since 1981. And freezing weather is hitting the Deep South, including Florida's orange groves...
【简答题】一水平放置的液压缸,采用三位四通电磁换向阀,要求阀处于中位时,液压泵卸荷且液压缸处于浮动状态, 三位四通电磁换向阀中位机能应选用____。
【单选题】一水平放置的液压缸,采用三位四通电磁换向阀,要求阀处于中位时,液压泵卸荷且液压缸处于浮动状态,三位四通电磁换向阀中位机能应选用_____型;
A.
M
B.
O
C.
H
D.
P
【简答题】化学渗透理论(chemiosmotic theory)
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