For grating in the optical pick-up head, the compensability between the longitudinal and transverse error practical references on the manufacture of grating.

学头分束栅，其纵向加工误差与横向加工误差的补，栅的具体制作有着实际的参考价值。

It is shown that test aerospike nozzle has good altitude compensability of thrust.

实验表明，塞式喷管具有良好的高度补偿能力和较高的效率。