怀疑肠套叠作诊断性空气灌肠时，注气压力宜选用（）

A.6.0kPa

B.8.0kPa

C.9.6kPa

D.10.6kPa

E.13.3kPa

Is it the sole aim of most Americans to make money and possess luxuries which could be called excessive The majority of Americans would certainly deny this, though most feel proud to amass wealth and possessions through hard work. In the USA, about 90% of the population is well enough off to expect a brighter future. The USA still has one of the highest standards of living in the world, although, at the present times, 10% are below what the Government considered to be below the "poverty level. " While these under-privileged people receive help from the Government, they have no high hopes for their future. It is from this "underclass," and those who take advantage of it, that most of the violence springs—the violence, which is one of the least pleasant aspects of American society. Some believe that the only guarantee of security is wealth, and the only way out for the poor is to get money.