滤光片作为色散元件的道理是因为它能（）一定波段范围的单光片。
A.折射
B.吸收
C.透过
D.反射
参考答案：C
Over a very large number of trials, the probability of an event______is equal to the probability that it will not occur.
A．occurring
B．to occur
C．occurs
D．occur
移风易俗
