Why is laser so powerful? _____.
A.Because it can be transmitted over a long distance B.Because it is a strong light C.Because it can be precisely focused D.Because it can travel to the moon正确答案C
Why is laser so powerful? _____.
A.Because it can be transmitted over a long distance B.Because it is a strong light C.Because it can be precisely focused D.Because it can travel to the moon正确答案C
