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【单选题】
如图9-4所示,设s1、s2为两相干光源发出波长为l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之差Δr,光程差δ 和相位差Δφ分别为A.
Δr = 0 ,δ = 0 ,Δφ = 0
B.
Δr= (n1-n2) r ,δ=( n1-n2) r ,Δφ=2π (n1-n2) r/λ
C.
Δr = 0 ,δ=( n1-n2) r ,Δφ=2π (n1-n2) r/λ
D.
Δr = 0 ,δ=( n1-n2) r ,Δφ=2π (n1-n2) r
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【简答题】[ A] numerous [ B] monstrous [ C] tremendous [ D] industrious
【简答题】A．endless B．multiple C．uncountable D．numerous
【简答题】若f(x)在x处连续，｜(x)｜、f2(x)在x0处是否连续?又若｜f(x)｜、f2(x)在x0处连续，f(x)在x0处是否连续?
【单选题】已知函数f（x）= ，有下面四个结论： ①f（x）在x=0处连续； ②f（x）在x=﹣3处连续； ③f（x）在x=0处可导； ④f（x）在x=﹣3处可导． 其中正确结论的个数是 [ ]
A.
1个
B.
2个
C.
3个
D.
4个
【简答题】A．numerical B．numerable C．enormous D．numerous
【单选题】“The problems are as numerous as trivial. ” Which of the following sentences correctly indicates the meaning:
A.
There are numerous problems, but they are trivial.
B.
Although there are numerous problems, they are trivial.
C.
The problems are numerous, and they are trivial.
D.
The problems are numerous, so they are trivial.
【简答题】A)enormous B)considerable C)numerous D)giant
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