依据《安全生产法》和《标准化法》的规定，涉及安全生产方面的标准主要有国家标准和行业标

The chief manager has decided to put _____ he thinks is energetic, clever and capable to the position of the leadership of the company.

A．whatever

B．whoever

C．whichever

D．whomever

安静状态下持续性动脉舒张压超过多少kpA即可诊断高血压病（）。

A.9kpA

B.10kpA

C.11kpA

D.12kpA

E.13kpA

气井生产时，输压下降，静压下降，差压上升的原因及处理办法是什么？

患者，男，52岁，善饥多食，口干舌燥，形体消瘦，大便干燥，数日不行，舌红，苔黄燥，脉细滑，治疗宜选方

A．玉女煎

B．白虎加人参汤

C．增液承气汤

D．消渴方

E．二冬汤

All known techniques for handling complex problems successfully seem to fall into one of the three classes: subdividing the problem (51) , ignoring irrelevant detail in a safe way (52) , and having an independent agent (53) the internal consistency (contextual checking). The first two provide guidelines for solving the problem, the third serves to provide early warnings. A good programming language supports all three.

In subdividing problem, some of the subproblems may be similar to the (54) problem. It leads us to a (55) solution. This (55) solution is viable provided each of the subproblems is easier to solve than the original problem.

（51）是（）

A.abrogation

B.abstraction

C.composition

D.contraction