pulse repetition frequency, PRF
pulse repetition frequency, PRF
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营销数据库管理的基本法则RFM法则是()的缩写。 A:Recency，Finance，MonetaryB:Responsibility，Finance，MoneyC:Responsibility，Frequency，MonetaryD:Recency，Frequency，Monetary
关于脉冲重复频率（PRF）与取样门宽度，叙述正确的有A、PRF是单位时间（s）发射短脉冲的次数，在PW中PRF是个重要参数B、PRF是以kHz计，而超声波频率是以MHz计，是两个相同的概念C、调节PRF可选择PW取样门距探头位置的距离，它限定了仪器最大探测深度D、PRF调定后，可再改变取样门宽度（L）E、连续波多普勒可测高速血流，脉冲多普勒测速不受PRF的限制
GivenaclassRepetition：1.packageutils；2.3.publicclassRepetition{4.publicstaticStringtwice（Strings）{returns+s；}5.}andgivenanotherclassDemo：1.//insertcodehere2.3.publicclassDemo{4.publicstaticvoidmain（String[]args）{5.System.out.println（twice（”pizza”））；6.}7.}Whichcodeshouldbeinsertedatline1ofDemo.javatocompileandrunDemotoprintpizzapizza”？（）A.importutils.*；B.staticimportutils.*；C.importutils.Repetition.*；D.staticimportutils.Repetition.*；E.importutils.Repetition.twice（）；F.importstaticutils.Repetition.twice；G.staticimportutils.Repetition.twice；
Given a class Repetition:Which code should be inserted at line 1 of Demo.java to compile and run Demo to print pizzapizza?() A.import utils.*;B.static import utils.*;C.import utils.Repetition.*;D.static import utils.Repetition.*;E.import utils.Repetition.twice();F.import static utils.Repetition.twice;G.static import utils.Repetition.twice;
You have a MAG Series device with IP address 10.0.1.5 and hostname ad .pulse.local acting as an IF-MAP Federation server. The subject name of the device certificate on this server is ad .pulse.local.Which server URL must you configure on the IF-MAP clients communicating with this IF-MAP Federation server?（）A. https://acl.pulse.local/dana-ws/soap/dsifmapB. http://acl.pulse.local/dana-ws/soap/dsifmapC. https://acl/dana-ws/soap/dsifmapD. http://10.0.1.5/dana-ws/soap/dsifmap
OFDM的英文是()A.OverloadFrequencyDivisionMultiplexingB.Orthogonal?Frequency?Division?MultiplexingC.Overwhelming?Frequency?DivisionMultiplexingD.Outstanding?Frequency?Division?Multiplexing
1、5.对债券现金流的贴现的函数以下那种写法是正确的 （）A．A cfs ＜- 100 * (rep(couponRate/frequency, n) + c(rep(0, n ),1))B．B cfs ＜- 100 * (rep(couponRate/frequency, n-1) + c(rep(0, n - 1),1))C．C cfs ＜- 100 * (rep(couponRate/frequency, n) + c(rep(0, n - 1))D．D cfs ＜- 100 * (rep(couponRate/frequency, n) + c(rep(0, n - 1),1))
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