橡胶类防化服自生产之日起满5年应作退役处理。
参考答案：对
The old couple were both very ______ and felt the new-born baby was a gift from God. [ ]
A. patient
B. original
C. religious
D. loyal
水平桌面上质量为1kg的物体受到2N的水平拉力，产生1.5m/s2的加速度。若水平拉力增至4N，则物体将获得的加速度为 [ ]
A、2.5 m/s2
B、3.5 m/s2
C、4 m/s2
D、3 m/s2
