第一章测试1.Steps at the math modeling are（ ）。
A:Quality’s analysis of uniqueness solution or multiplicity of the problem solution. For this aim, as a rule, the pointwise model is derived from PDEs. B:Derivation of the conservation laws (integrals of motions) for the problem under consideration. C:Introducing dimensionless variables and writing similarity parameters (π - parameters). D:Developing finite-difference schemes (finite-elements scheme) for numerical solution of the problem under consideration. E:Analysis of the physical and chemical processes occurring in process under consideration. F:Writing of the differential (and other) equations describing the process under consideration. G:Analysis of physical units of each terms involving in the equations.
答案:F
2.Which of the following options is the requirement for the numerical method?（ ）。
A:All of the above B:The numerical method must be tested by using the well-known solutions of the problem under consideration. C:FDS must be economical one. It means that 3D or 2D difference equations must be solved as sequence of 1D difference equations. D:High order of approximation of the differential equations by numerical solution.
答案:A
3.The following are applications of laser radiation in the field of physics?（ ）。
A:Optical data storage(CD, SVD, 5D optical memory) B:Astrophysics C:Nanophotonics D:Photochemistry
答案:ABC
4.What fields can laser radiation be used in?（ ）。
A:LaserMedicine B:Laser Chemistry C:Physics D:LaserBiology
答案:ABCD
5.What are the properties of laser radiation?（ ）。
A:Laser emits monochromatic wave. Usually laser emits single wavelength. B:Stimulated emission. C:Divergence of laser beam is small. D:Coherence (spatial, temporal). E:Polarization.
答案:ABCDE
6.The one that can explain the experimental curve of blackbody radiation perfectly is （ ）
A:Planck's formula B:Einstein's formula C:the Riley-Pierce equation D:Wien's formula
答案:A
7.A concave cavity with a concave mirror of radius R equal to the cavity length L is a （ ）.
A:unsteady cavity B:Critical cavity C:Uncertain D:Stabilizing cavity
答案:B
8.The wavelength of the CO2 laser is（ ）
A:810nm B:1064nm C:335nm D:10.6μm
答案:D
9.The basic structure of the laser consists of electrical working matter, pump source and （ ） three parts.
A:Reflector B:Optical resonant cavity C:Window mirror D:Affected pole
答案:B
10.Carbon dioxide lasers commonly used gas mixture composition is composed of （ ）, helium, argon, nitrogen.
A:Carbon dioxide B:Neon gas C:Carbon monoxide D:Oxygen
答案:A
