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【简答题】
已知在 298 K 时,下述反应及其反应热为 C 2 H 5 OH(l) + 3O 2 → 2CO 2 (g) + 3H 2 O(l) = - 1367 kJ•mol -1 C(g) + O 2 (g) → CO 2 (g) = - 394 kJ•mol -1 H 2 (g) + 1/2 O 2 (g) → H 2 O(l) = - 286 kJ•mol -1 求 C 2 H 5 OH(l) 的 。
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举一反三
【多选题】死锁处理方法主要包括()
A.
死锁预防(Deadlock Prevention):确保系统永远不会进入死锁状态
B.
死锁避免(Deadlock Avoidance):在使用前进行判断，只允许不会出现死锁的进程请求资源
C.
死锁检测和恢复(Deadlock Detection and Recovery)：在检测到运行系统进入死锁状态后，进行恢复
D.
由应用进程处理死锁：通常操作系统忽略死锁
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【判断题】Deadlock prevention and deadlock avoidance are essentially the same approaches for handling deadlock.
A.
正确
B.
错误
【简答题】（ 1 3 - 1 5 ）× (- 1 5 ) -2 ÷| - 1 3 |+ ( 3 -2 ) 0 +(- 1 4 ) 2003 ×4 2004
【单选题】Deadlock prevention is a set of methods ____________
A.
to ensure that at least one of the necessary conditions cannot hold
B.
to ensure that all of the necessary conditions do not hold
C.
to decide if the requested resources for a process have to be given or not
D.
to recover from a deadlock
【简答题】No one can change the weather. Nobody can control the weather. But if we read correctly the signs around us, we can tell what the more important changes in the weather will be. This way of telling wha...
【单选题】Each country has to earn ___________ to pay for imports.
A.
money
B.
Trade surplus
C.
Trade deficit
D.
Trade barrier
【单选题】—What's the weather like? — . [ ]
A.
I like the weather
B.
It's sunny
C.
I don't like the weather
D.
It's rain
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