试述推力头安装的工艺过程。

喘证与气短的共同点是（）

A.呼吸异常

B.呼吸症状相似

C.呼吸程度相同

D.舌脉相同

E.病机相同

休克指数（脉搏／收缩压）有助于判断休克的严重程度，正确的表达是（）。

A.正常时为0.1，0.2～0.4以上时为休克，1.2以上为重度休克

B.正常时为0.2，0.4～0.6以上时为休克，1.4以上为重度休克

C.正常时为0.3，0.6～0.8以上时为休克，1.6以上为重度休克

D.正常时为0.4，0.8～1.0以上时为休克，1.8以上为重度休克

E.正常时为0.5，1.0～1.5以上时为休克，2.0以上为重度休克

在市场经济条件下，履行教师道德义务应该以获得权利和报偿为前提。

将会计凭证划分为原始凭证和记账凭证两大类的依据是( )

A．填制的时间

B．填制的方法

C．填制的程序和用途

D．凭证反映的经济内容

There are two factors which determine an individual’s intelligence. The first is the sort of brain he is born with. Human brains differ considerably, some being more capable than others. But no matter how good a brain he has to begin with, an individual will have a low order of intelligence unless he has opportunities to learn. So the second factor is what happens to the individual—the sort of environment in which he is reared. If an individual is handicapped environmentally, it is likely that his brain will fail to develop and he will never attain the level of intelligence of which he is capable.

The importance of environment in determining an individual’s intelligence can be demonstrated by the case of the identical twins, Peter and Mark Being identical, the twins had identical brains at birth, and their growth processes were the same. When the twins were three months old, their parents died, and they were placed in separate foster homes. Peter was reared by parents of low intelligence in an isolated community with poor educational opportunities. Mark was reared in the home of well to do parents who had been to college. He was read to as a child, sent to good schools, and given every opportunity to be stimulated intellectually. This environmental difference continued until the twins were in their late teens, when they were given tests to measure their intelligence. Mark’s IQ was 125, twenty five points higher than the average and fully forty points higher than his identical brother. Given equal opportunities, the twins, having identical brains, would have tested at roughly the same level.

The case of the twins appears to support the conclusion that（）

A．individual with identical brains seldom test at same level

B．an individual’s intelligence is determined only by his environment

C．lack of opportunity blocks the growth of intelligence

D．changes of environment produce changes in the structure of the brain