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

对学头分，其纵向加工误差与横向加工误差间存在的补性，对的具体制作有着际的参考价。

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

表明，塞式喷管具有良好的高度补偿能力和较高的效率。