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【单选题】
已知汽轮机进出口蒸汽参数，试分析汽轮机实际做功W1、理想做功W2、和进出口㶲差W3之间的关系。A.
W1 ＞ W2 ＞ W3
B.
W1 ＞ W3 ＞ W2
C.
W2 ＞ W3 ＞ W1
D.
W3 ＞ W1 ＞ W2
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反馈参考答案：
举一反三
【简答题】必需氨基酸和非必需氨基酸(essential and non-essential amino acids)
【单选题】To drive a car safely, it is ________ good brakes.
A.
essential with
B.
essential having
C.
essential to have
D.
essential have
【简答题】必需基团(essential residues)
【单选题】Which of the following would most likely not be an essential objective of a project team kick-off meeting
A.
. Create a project technology master plan
B.
. Get team members to know one another
C.
. Identify project problem areas
D.
. Obtain individual and group commitments
E.
. Identify the project coordinator
【简答题】essential element
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