题目

Tea drinking was common in China for nearly one thousand years before anyone in Europe had ever heard about tea．People in Britain were much slower in finding out what tea was like, mainly because tea was very expensive. It could not be bought in shops and even those people who could afford to have it sent from Holland did so only because it was a fashionable curiosity. Some of them were not sure how to use it. They thought it was a vegetable and tried cooking the leaves. Then they served them mixed with butter and salt. They soon discovered their mistake but many people used to spread the us关于激光的应用问题，下列说法中不正确的是(　　)．A．光纤通信是应用激光平行度非常好的特点对信号进行调制，使其在光导纤维中进行传递信息B．计算机内“磁头”读出光盘上记录的信息是应用了激光有相干性的特点来进行的C．医学中用激光作“光刀”来切除肿瘤是应用了激光强度大的特点D．“激光测距雷达”利用激光测量很远目标的距离是应用了激光亮度高的特点