【多选题】典型调查的优点主要体现在
A.
调查对象少,可作深人细致的调查研究,以便深刻揭示事物的本质和规律
C.
节约时间,可迅速取得调查结果,从而快速了解市场情况
【简答题】试述筛选营养缺陷型菌株的方法,并说明营养缺陷型菌株在应用上的作用。
【简答题】阅读材料,完成下列要求。 国务院印发的《2016年推进简政放权放管结合优化服务改革工作要点》指出,凡是法律法规未明确禁止的,一律允许各类市场主体进入;凡是已向外资开放或承诺开放的领域,一律向民间资本开放;凡是影响民间资本公平进入和竞争的各种障碍,一律予以清除。研究制定促进民间投资的配套政策和实施细则,破除民间投资进入电力、电信、交通、石油、天然气、市政公用、养老、医药、教育等领域的不合理限制和隐性...
【单选题】In the fourth paragraph, the author implies that imagination is most important to scientists when they ______.
B.
formulate possible solutions to a problem
C.
evaluate previous work on a problem
D.
close an investigation
【判断题】强度、塑性和硬度是静载荷作用下的力学性能指标
【判断题】由于基础结构属于单位工程一部分,因此可以采用单位工程验收方式。
【单选题】In the fourth paragraph, the author implies that imagination is most important to scientists when they
A.
evaluate previous work on a problem
B.
formulate possible solutions to a problem
D.
close an investigation
【单选题】下列关于碳钢的力学性能,叙述错误的是( )
A.
碳钢的强度、塑性、硬度、韧性和疲劳强度都是在静载荷作用下测试的
C.
碳钢的强度主要有屈服强度和抗拉强度两个指标,塑性主要有断后伸长率和断面收缩率两个指标
【单选题】Passage Three Many theories about the origin of the ocean have been proposed by scientists. The most widely accepted one is that the earth at some time in its very early history became hot enough to m...
A.
the origin of the earth
B.
the origin of the ocean
C.
the history of the earth
D.
the forming of the earth's crust