r45
r45-
All R45 aircraft have been grounded , after a defect in the engine cooling system was discovered .
发现引擎的冷却系统有点小毛病后，所有的r45飞机都停飞了。
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The surface structure , relaxation , and oxygen adsorbed ( 2 × 22 ) R45 ° Cu ( 100 ) surface are studied by ab initio total energy calculation .
用第一性原理的总能计算研究了Cu（100））面的表面结构、弛豫以及氧原子的（2×22）吸附状态。