| It is a curious paradox that we think of the
physical sciences as "hard", the social sciences as "soft", and the biological
sciences as somewhere in between. This is interpreted to mean that our knowledge
of physical systems is more certain than our knowledge of biological systems,
and these in mm are more certain than our knowledge of social systems. In terms
of our capacity to sample the relevant universes, however, and the probability
that our images of these universes are at least approximately correct, one
suspects that a reverse order is more reasonable. We are able to sample earth’s
social systems with some degree of confidence that we have a reasonable sample
of the total universe being investigated. Our knowledge of social systems,
therefore, while it is in many ways extremely inaccurate, is not likely to be
seriousl A. theories of its origin and history are varied B. our knowledge of it is highly insecure C. only a very small sample of it has been observed D. few scientists are involved in the study of astronomy [简答题]拖网的渔具渔法有什么特点？
[单选题] 为能达到较高的脱盐率,下列说法错误的是( )。
A.一般情况下,电场强度提高,脱盐率则随之提高 B.但超过一定范围,再提高电场强度,对提高脱盐率效果不大 C.引进的国外电脱盐电场强度大都在1000V/cm3左右 D.因此电场强度越大越好 [判断题]根据《配电安规》，柜式配电设备的母线侧封板应使用专用螺丝和工具，专用工具应妥善保存，柜内有电时禁止开启。
A.正确 B.错误 [单选题] 线路允许速度160km/h≥vmax＞120km/h，波浪型磨耗谷深超过（ ）mm时为轻伤钢轨。
A.0.3 B.0.5 C.1 D.2 [多项选择]积极倾听的前提在父母方面有（）。
A. 真诚 B. 接纳 C. 同理心 D. 主动 [单项选择]行阴道镜检查时，下列哪种图像属于正常宫颈上皮（ ）
A. 涂醋酸着色后，边界清楚，无血管，碘试验阴性 B. 光滑呈粉红色，涂3%醋酸后上皮不变色，碘试验阳性 C. 可见异型血管 D. 可见白色上皮或白斑 E. 以上都不对 [单选题]判断题填土土料的含水量越小，填土压实质量越好。
A. 正确 B. 错误 [填空题]电缆隧道、偏僻山区、夜间、事故或恶劣天气等巡视工作，应至少( )人一组进行。
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