题目内容

偏振光射到偏振片上，当旋转偏振片时，光强不变化。

A. 对
B. 错

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部分偏振光射到偏振片上，当旋转偏振片时，光强有极大和极小变化。

A. 对
B. 错

When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D.

A. I am alone.
B. Fine, thanks.
C. What about you?
D. It’s late.

When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D.

A. It’s sunny.
B. I guess so.
C. It’s interesting.
D. It’s right.

When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D.

A. Thank you.
B. Me too.
C. Fine.
D. How do you do?