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【单选题】
在UML提供的图中,( )用 于按时间顺序描述对象之间的交互。A.
对象图
B.
状态图
C.
活动图
D.
时序图
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举一反三
【多选题】What are the differences of combinational logic circuits from sequential logic circuits?
A.
Sequential logic circuits require a means by which events can be sequenced, so do combinational logic circuits.
B.
Sequential logic circuits require a means by which events can be sequenced, while combinational logic circuits do not need.
C.
Combinational logic circuits are perfect for situations when we require the immediate application of a Boolean function to a set of inputs, however, sequential logic circuits to change its value with consideration to its current state as well as its inputs.
D.
Combinational logic circuits are perfect for situations when we require the immediate application of a Boolean function to a set of inputs, so do sequential logic circuits.
【单选题】Do you mind my turning up the radio？The weather report________and I’d like to know when it will clear up. [ ]
A.
is broadcast
B.
is being broadcast
C.
has been broadcast
D.
had been broadcast
【简答题】有一种神奇的蜡烛，点燃后任你怎么吹也吹不灭，而且看上去和普通的蜡烛一模一样， 到底是什么玄机能让蜡烛持续燃烧？请你一起参与探究。 【查阅资料】普通蜡烛由石蜡和蜡烛芯制成的，而吹不灭的蜡烛是在蜡烛芯上包裹一层打火石的粉末。打火石是由某种金属掺入少量稀土元素制成的合金，它的着火点只 有150℃。当蜡烛燃烧时，金属并不燃烧；但当蜡烛吹灭后，未冷却的金属接触到氧气就发生燃烧，从而使蜡烛复燃。 【探究与反思...
【简答题】有一种神奇的蜡烛，点燃后任你怎么吹也吹不灭，而且看上去和普通的蜡烛一模一样，那么到底是什么玄机能让蜡烛持续燃烧？请你一起参与探究。 【查阅资料】普通蜡烛由石蜡和蜡烛芯制成的，而吹不灭的蜡烛是在蜡烛芯上包裹一层打火石的粉末。打火石是由某种金属掺入少量稀土元素制成的合金，它的着火点只有150℃。当蜡烛燃烧时，金属并不燃烧；但当蜡烛吹灭后，未冷却的金属接触到氧气就发生燃烧，从而使蜡烛复燃。 【探究与反思...
【单选题】The logic module in an FPGA logic block can be configured for
A.
combinational logic
B.
parallel mode logic
C.
registered logic
D.
both (a) and (c)
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