例句與造句

1. in this thesis, based on pershing ii surface to surface missile, a new kind of ballistic missile was designed with an additional rocket engine, which can be ignited twice . firstly, aerodynamic computational models of missile body and warhead which reentry with supersonic are built according to the task requirements; secondly, the propulsion system model of missile is built whose first two stages are solid rocket engines and the third stage is liquid-solid combined rocket engine . the nozzle and the shape of the engine are designed to meet the needs of the populsion project; thirdly, the trajectory model of the mass point is built and a wavy trajectory is designed & optimized; finally, the ability of a missile's breaking through defence is analyzed
   以美國潘興導(dǎo)彈為原型，增加可兩次點(diǎn)火的末級發(fā)動機(jī)，改裝成具有跳躍能力的地地彈道導(dǎo)彈；首先，根據(jù)任務(wù)需求，建立了導(dǎo)彈的氣動模型，并建立了彈頭再入時高超聲速氣動模型；其次，建立了導(dǎo)彈推進(jìn)系統(tǒng)模型，前兩級采用了固體火箭發(fā)動機(jī)，第三級采用了固?液組合火箭發(fā)動機(jī)，并在總體方案要求下，對發(fā)動機(jī)噴管和外形進(jìn)行了設(shè)計；第三部分，建立了導(dǎo)彈質(zhì)點(diǎn)彈道模型，設(shè)計了一條跳躍式彈道，并對跳躍式彈道進(jìn)行了優(yōu)化設(shè)計；最后，對導(dǎo)彈進(jìn)行了突防能力分析，從分析的結(jié)果可以看出，跳躍式彈道的突防能力比常規(guī)的拋物線彈道要強(qiáng)。
2. It's difficult to find surface to surface missile in a sentence. 用surface to surface missile造句挺難的