液相杂交
参考答案：
是核酸分子杂交的一种，指待测核酸样品与探针在液相中发生杂交。
客票系统安全突发事件分为哪四级？
— Steven, could you help me _____ when the plane will take off on the Internet?
— I'm sorry, my computer doesn't work. [ ]
A. get on
B. find out
C. look for
D. look after
