全身性感染所致肾功能障碍多为非少尿性。其特点为：（） A．内生肌酐清除率降低，血BU

症状性颈动脉狭窄患者，如围手术期卒中或死亡风险＜6%，可考虑行颈动脉内膜切除术的狭窄程度为（）.

A.50%～99%

B.50%～70%

C.50%～90%

D.70%～99%

E.60%～80%

下面是关于“用天平和量筒测盐水的密度”实验的步骤描述，请按要求填空。

（1）

①组装好天平并将其放在水平台上，然后将游码移至标尺的零刻度处，观察指针指示如图甲所示，则应将平衡螺母向_______调。

②在玻璃杯中盛盐水，放在已调好的天平左盘，称量结果为m₁=124.2g。

③玻璃杯中的部分盐水倒入量筒中，如图乙，记下量筒中盐水体积。

④把玻璃杯和剩余盐水又放在天平左盘上称量，当天平重新平衡时，所用砝码和游码位置如图丙所示，将玻璃杯和剩余盐水的质量m₂填入下表中。

（2）计算出盐水的质量和密度，填入下表中。

In looking at the class structure of an entire system, we may find that its inheritance (1) is either wide and shallow, narrow and deep, or balanced. Class structures that are wide and shallow usually represent forests of (2) classes that can be mixed and matched. Class structures that are narrow and deep represent trees of classes that are related by a common ancestor. There are advantages and disadvantages to each approach. Forests of classes are more loosely (3) , but they may not exploit all the commonality that exists. Trees of classes exploit this commonality, so that individual classes are smaller than in forests. However, to understand a particular class, it is usually necessary to understand the meaning of all the classes it inherits from or uses. The proper shape of a class structure is highly problem-dependent.
We must make similar trade-offs among inheritance, aggregation, and using relation- ships. For example, should the class Car inherit, contain, or use the classes named Engine and Wheel In this case, we suggest that an (4) relationship is more appropriate than inheritance relationship. Meyer states that between the class A and B," (5) is appropriate if every instance of B may also be viewed as an instance of A. The client relationship is appropriate when every instance of B simply possesses one or more attributes of A". From another perspective, if the behavior of an object is more than the sum of its individual parts, then creating an aggregation relationship rather than an inheritance relationship between the appropriate classes is probably superior.

(5)

A．aggregation

B．inheritance

C．association

D．using

在营养不良的治疗中错误的是

A．治疗原发病
B．正确喂养，调整饮食
C．促进消化功能
D．重度营养不良应早期供给足够的热量
E．控制继发感染

家庭旅游购买决策中妻子的角色表现在（）

A.行前准备：信息收集、行李准备等

B.行程中：多购物、多餐厅选择

C.少理财

D.住宿选择性逐步增强