【简答题】三个偏振片P1,P2与P3堆叠在一起,P1与P3的偏振片化方向相互垂直,P2与P1的偏振化方向间的夹角为30°。强度为I0的自然光垂直入射于偏振片P1,并依次透过偏振片P1 、P2与P3,则通过三个偏振片后的光强为()。 (A) I0/4 (B) 3I0/8 (C) 3I0/32 (D) I0/16
【单选题】______ (1922) , James Joyce s masterpiece, has become a prime example of modernism in literature.
D.
The Virgin and the Gypsy
【单选题】4 Which of the following songs is not sung by Carpenters?
D.
Nothing’s gonna change my love for you
【单选题】三个偏振片P1,P2与P3堆叠在一起,P1与P3的偏振片化方向相互垂直,P2与Pl的偏振化方向间的夹角为30°。强度为I0的自然光垂直入射于偏振片P1,并依次透过偏振片P1、 P2与P3,则通过三个偏振片后的光强为( )。
【单选题】P1,P2和P3三个偏振片堆叠在一起,其中P2与P1的偏振化方向间的夹角为30°,P1与P3的偏振方向相互垂直。若强度为I0的自然光垂直入射于偏振片P1,并依次透过偏振片P1,P2与P3,则通过三个偏振片后的光强(忽略偏振片的吸收)为( )。
【单选题】2 Which of the following songs is not sung by Celine Dion?
【单选题】1 Which of the following songs belongs to American country music?
C.
Take me home, country roads
【单选题】牛和羊在分娩过程中,如果是正生,胎儿通过母体盆腔最为困难的部位是()