学生实验中经常使用的冷凝管有哪些？各用在什么地方？

液压试验检查期间，要保压足够时间，若发现压力稍有降低，可采用连续加压来维持试验压力不变。

An experiment was done in which human subjects recognize a pattern within a matrix of abstract designs and then select another design that completes that pattern. The results of the experiment were surprising. The lowest expenditure of energy in neurons in the brain was found in those subjects who performed most successfully in the experiments.
Which of the following hypotheses best accounts for the findngs of the experiment ？（）

A．The neurons of the brain react less when a subject is trying to recognize patterns than when the subject is doing other kinds of reasoning.

B．Those who performed best in the experiment experienced more satisfaction when working with abstract patterns than did those who performed less well.

C．People who are better at abstract pattern recognition have more energy-efficient neural connections.

D．The energy expenditure of the subjects brains increases when a design that completes the initially recognized pattern is determined.

E．The task of completing a given design is more capable performed by athletes, whose energy expenditure is lower when they are at rest than is that of the general population.

研究传染病常用的动物模型是（）

A.无菌动物

B.悉生动物

C.无特殊病原体动物

D.清洁动物

E.普通动物

（）是指为了维持消防装备所规定的机能，按标准对消防装备的规定部位，通过认得无关或运用监测手段，进行无异状的调查，使消防装备的异状和劣化能够被早期发现、早期预防和早期修复。

A.前期管理

B.“5S”管理

C.点检管理

D.维修管理

换装104分配阀时，螺栓应（）。

A.顺时针拧紧

B.逆时针拧紧

C.对角拧紧

D.拧紧即可