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

对光学头分束光栅，其纵向加工横向加工间存在的补性，对光栅的具体制作有际的参考价值。

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

验表明，塞式喷管具有良好的高度补偿能力和较高的效率。