A．lthough a given waveform. may contain frequencies over a very broad range，as a practical matter any transmission system will be able to accommodate only a limited band of (71) ．This，in turn，limits the data rate that can be carried on the transmission (72) ．Asquare wave has an infinite number of frequency components and hence an infinite (73) ．However, the peak amplitude of the kth frequency component，kf，is only 1/k，so most of the (74) in this wavefonn is in the first few fiequency components．In general，any digitalwaveform. will have (75) bandwidth．If we attempt to transmit this waveform. as a signalover any medium，the transmission system will limit the bandwidth that can be transmitte

（71）

A．frequencies

B．connections

C．diagrams

D．resources

[单选题] Although a given waveform. may contain frequencies over a very broad range, as a practical matter any transmission system will be able to accommodate only a limited band of （71） . This, in turn, limits the data rate that can be carried on the transm

[单选题]The rim of the piston may contain cut-out portions to accommodate （） when they open.A . the gasesB . the airC . the valvesD . the injector

[单选题]Although some countries have taken action to solve the shortage of water, i

[单选题]A gudgeon pin in a trunk piston may be free to float and rotate, with （） to limit axial movement.A . split pinsB . crankpinsC . dipsticksD . circli

[单选题]After "F.W.E" is given, the air system is shut down, the （） gear put in, all drains and indicator cocks opened, and the cooling water kept running.A . steeringB . timingC . turningD . running

[单选题]类 Contain 的定义如下： class Contain { private: int x; protected: int z; public: class Embed { private: int y; public: Embed ( ) { y=100; } int Embed_Fun(); }MyEmbed; int Contain_Fun(); }； 下列对上面定义的描述中，正确的是( )。A．定义类Embed对象的语句是：Contain：：Embed Myobject；B．类Con

[单选题]Which of the following does not contain a non-finite clause?A．He swims in the river every day.B．Do you mind my shutting the door?C．It's been nice talking to you.D．There being nothing to do, he left.

[单选题]Which of the following does not contain a non-finite clause?A．He swims in the river every day.B．Do you mind my shutting the door?C．It's been nice talking to you.D．There being nothing to do, he left.

[单选题]（） the cylinder will contain a great weight of air and will be capable of burning a great quantity of fuel.A . At the beginning of the compression strokeB . At the beginning of the suction strokeC . At the end of the working strokeD . At the end of t

[单选题]The standard (67) in C language contain many useful functions for input and output，string handling，mathematical computations，and system programming tasks.(67) A．databaseB．filesC．librariesD．subroutine