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【单选题】
班组长是本班组安全( )责任人A.
主要
B.
重要
C.
第一
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【单选题】For a first-order process A→P, the initial concentration of A is 0.65 M. After 20 minutes elapse, the concentration of A is 0.35 M. What is the rate constant for this process?
A.
0.031 s -1
B.
5.2 x 10 -4 s -1
C.
-5.2 x 10 -4 s -1
D.
1.9 s -1
【简答题】The Argentine peso was fixed through a currency board at Ps1.00/$ throughout the 1990s. In January 2002 the Argentine peso was floated. On January 29, 2003, it was trading at Ps3.20/$. During that one...
【单选题】理想气体在高温热源温度ＴH 和低温热源温度ＴL 之间的卡诺循环的热效率为______。
A.
(ＴH–ＴL )/ＴH
B.
ＴH /(ＴH–ＴL )
C.
ＴL /(ＴH–ＴL )
D.
(ＴL–ＴH ）/ＴL
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