空冷器主要由哪几部分设备或部件构成？

不确定性是所有项目固有的内在特性，只是针对不同的项目，不确定性的程度有大有小。下列关于项目不确定性分析的表述中正确的是（）。

A.常用的不确定性分析方法有盈亏平衡分析、敏感性分析和概率分析

B.如果主要分析方案状态和参数变化对方案投资回收快慢的影响，则可选用投资收益率作为分析指标

C.如果主要分析投资大小对方案资金回收能力的影响，则可选用内部收益率指标

D.概率分析是利用概率来研究和预测不确定因素对项目经济评价指标的影响的一种定量分析方法

E.盈亏平衡分析的优点是可以揭示风险产生的根源及有效控制风险的途径

显微镜观察时，光线较暗，应使用：（）

A、大光圈、平面镜

B、小光圈、凹面镜

C、小光圈、平面镜

D、大光圈、凹面镜

肝的生理特性是

A．主藏血，调节血量

B．主疏泄，调畅气机

C．喜条达而恶抑郁

D．主血海而调冲任

E．主筋脉，开窍于目

全科医生的素质包括下列哪几项（）

A.对病人有高度的同情心和责任感

B出色的管理能力

C科学的态度

D自我发展的能力

E具有较强的疑难杂病处理能力

Young girls at high risk for depression appear to have a malfunctioning reward system in their brains, a new study suggests. The finding comes from research that (1) a high-risk group of 13 girls, aged 10 to 14, who were not depressed but had mothers who (2) recurrent depression and a low-risk group of 13 girls with no (3) or family history of depression. Both groups were given MRI brain (4) while completing a task that could (5) either reward or punishment.

(6) with girls in the low-risk group, those in the high-risk group had (7) neural responses during both anticipation and receipt of the reward. (8) , the high-risk girls showed no (9) in an area of the brain called the dorsal anterior cingulated cortex (背侧前扣带皮质), believed to play a role in (10) past experiences to assist learning.

The high-risk girls did have greater activation of this brain area (11) receiving punishment, compared with the other girls. The researchers said that this suggests that high-risk girls have easier time (12) information about loss and punishment than information about reward and pleasure.

"Considered together with reduced activation in the striatal (纹状体的) areas commonly observed (13) reward, it seems that the reward-processing system is critically (14) in daughters who are at elevated risk for depression, (15) they have not yet experienced a depressive (16) ," wrote Ian H. Gotlib, of Stanford University, and his colleagues. " (17) , longitudinal studies are needed to determine whether the anomalous activations (18) in this study during the processing of (19) and losses are associated with the (20) onset of depression," they concluded. The study was published in the April of the Archives of General Psychiatry.

5（）

A.result from

B.suppose to

C.result in

D.lead in