隐身技术
参考答案：
是通过降低武器装备等目标的信号特征，使其难以被发现、识别、跟踪和攻击的综合性技术。
--- Why are you so late?
--- I got stuck in the traffic jam, or I earlier.
A．arrived
B．had arrived
C．would arrive
D．would have arrived[
很多化学反应都在溶液中进行，这是因为______________。
