同时使用两种滴眼剂，宜间隔（）
A.2分钟
B.4分钟
C.6分钟
D.8分钟
E.10分钟
参考答案：E
Vehicle designers are well aware that they need to ______ the idea of cars that have a low environmental impact.
A．end up with
B．put up with
C．keep up with
D．come up with
A．N的上表面A处向上凸起
B．N的上表面B处向上凸起
C．N的上表面A处向下凹陷
D．N的上表面B处向下凹陷
