将十进制正整数d转换成r(2~9)进制的字符串,下列递归函数正确的是__________。
A: FunctionTrans$(ByVald%,ByValr%)Ifd=0ThenTrans=""ElseTrans=Trans(dr,r)&(dModr)EndIfEndFunction
B: FunctionTrans$(ByVald%,ByValr%)Ifd=0ThenTrans=""ElseTrans=(dModr)&Trans(dr,r)EndIfEndFunction
C: FunctionTrans$(ByVald%,ByValr%)Ifd=0ThenTrans=Trans(dr,r)&(dModr)ElseTrans=""EndIfEndFunction
D: FunctionTrans$(ByVald%,ByValr%)Ifd=0ThenTrans= (dModr)&Trans(dr,r)ElseTrans=""EndIfEndFunction
A: FunctionTrans$(ByVald%,ByValr%)Ifd=0ThenTrans=""ElseTrans=Trans(dr,r)&(dModr)EndIfEndFunction
B: FunctionTrans$(ByVald%,ByValr%)Ifd=0ThenTrans=""ElseTrans=(dModr)&Trans(dr,r)EndIfEndFunction
C: FunctionTrans$(ByVald%,ByValr%)Ifd=0ThenTrans=Trans(dr,r)&(dModr)ElseTrans=""EndIfEndFunction
D: FunctionTrans$(ByVald%,ByValr%)Ifd=0ThenTrans= (dModr)&Trans(dr,r)ElseTrans=""EndIfEndFunction
举一反三
- 将十进制正整数d转换成r(2~9)进制的字符串,下列递归函数正确的是__________。 A: Function Trans$(ByVal d%, ByVal r%) If d = 0 Then Trans = "" Else Trans = Trans(d \ r, r) & (d Mod r) End If End Function B: Function Trans$(ByVal d%, ByVal r%) If d = 0 Then Trans = "" Else Trans = (d Mod r) & Trans(d \ r, r) End If End Function C: Function Trans$(ByVal d%, ByVal r%) If d = 0 Then Trans = Trans(d \ r, r) & (d Mod r) Else Trans = "" End If End Function D: Function Trans$(ByVal d%, ByVal r%) If d = 0 Then Trans = (d Mod r) & Trans(d \ r, r) Else Trans = "" End If End Function
- 质点作曲线运动,在时刻t质点的位矢为r,速度为v,速率为v,t至t+Δt时间内的位移为Δr,路程为Δs,位矢大小的变化量为Δr。则下列选项正确的为( ) A: │Δr│=Δs=Δr B: │Δr│≠Δs≠Δr ,当Δt→0时有│dr│=ds ≠ dr C: │Δr│≠Δs≠Δr ,当Δt→0时有│dr│= dr ≠ ds D: │Δr│=Δs≠Δr ,当Δt→0时有│dr│= dr = ds
- 质点作曲线运动,在时刻t 质点的位矢为r,速度为v ,速率为v,t 至(t +Δt)时间内的位移为Δr, 路程为Δs, 位矢大小的变化量为Δr ( 或称Δ|r|).根据上述情况,则必有( ) A: |Δr|= Δs = Δr B: |Δr|≠ Δs ≠ Δr,当Δt→0 时有|dr|= ds ≠ dr C: |Δr|≠ Δr ≠ Δs,当Δt→0 时有|dr|= dr ≠ ds D: |Δr|≠ Δs ≠ Δr,当Δt→0 时有|dr|= dr = ds
- 若向量函数r(t)满足drº0,则r(t)是常向量
- 如图所示,两光源S1、S2发出波长为λ的单色光,分别通过两种介质(折射率分别为n1和n2,且n1>;n2)射到介质的分界面上的P点。己知S1P=S2P=r,则这两条光的几何路程差Dr,光程差D和相位差Dj分别为( )。[img=284x187]17e0b74962d8951.png[/img] A: Dr =0,D =0,Dj = 0 B: Dr=(n1-n2)r,D =(n1-n2) r,Dj =2p (n1-n2)r/l C: Dr =0,D =(n1-n2)r,Dj =2p (n1-n2)r/l D: Dr =0,D =(n1-n2) r,Dj =2p (n1-n2)r