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【简答题】
某车站售票厅,任何时刻最多可容纳 20 名购票者进入,当售票厅中少于 20 名购票者时,则厅外的购票者可立即进入,否则需在外面等待。若把一个购票者看作一个进程,请回答下列问题: (1) 用 wait 和 signal 操作管理这些并发进程时,应怎样定义信号量,写出信号量的初值以及信号量各种取值的含义。 (2) 根据所定义的信号量, 加上 wait(P操作) 和 signal(V操作) 原语,写出购票者进程的算法, 以保证进程能够正确地并发执行。 (3) 若欲购票者最多为 n 个人,写出信号量可能的变化范围 ( 最大值和最小值 ) 。
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【单选题】Topic sentence________________________________. One very real problem is that of traffic signs and signals. Those that are red green colour blind have trouble seeing stop signs found on shady streets ...
A.
Colour-blind people do not have so many problems as we expect.
B.
Colour-blind people have problems that we do not understand at all.
C.
Colour-blind people have problems that people who perceive colour never think about.
D.
Colour-blind people have problems that will be solved in the near future.
【单选题】Because of the ______ noise of traffic I couldn’t get to sleep last night.
A.
progressive
B.
provocative
C.
perpetual
D.
prevalent
【简答题】人体必需的“第七类营养素”是指____________。
【单选题】营养素是指( )
A.
富含蛋白质，脂肪等化合物的食物都可以称为营养素
B.
人类为生存，健康而从外界摄取的所有食物中能提供热能的物质
C.
人类从食物中所能获得的无机盐，维生素等宏量和微量元素物质的总称
D.
机体为维持健康，保证生长发育和体力劳动必须从外界摄取的营养物质
E.
凡是能够增加人体能量的物质都可以称为营养素
【简答题】P assage Three After the violent earthquake that shook Los Angeles in 1994, earthquake scientists had good news to report: the damage and death toll could have been much worse. More than 60 people die...
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