区别量变和质变的根本标志是( )。A．事物变化是否显著B．事物变化是否迅速c．事物

我国已成功发射“神舟”载人航天飞船，宇航员在飞船中可以直接对话，但在飞船外作业时，他们之间不能直接对话，必须借助电子通信设备进行交流，请简述原因：

天疱疮的激素治疗特点是（）。

A.用量大疗程短

B.分为起始、控制、减量、维持等阶段

C.口腔局部含化即可奏效

D.可以完全被中药代替

E.所有患者均可做到停药后病情不复发

In your project，you just conducted a risk data quality analysis to evaluate the degree to which the data about risks is useful for risk management．What could be a potential next step

A．Perform a structured review of project plans and assumptions，both at the total project and detailed scope level

B．Develop checklists for identifying risks based on historical information and knowledge that has been accumulated from previous similar project

C．Conduct planning meetings to develop the risk management pla

D．Conduct interviews to quantify the probability and consequences of risks on project activitie

利用无机碳和光能进行生长的微生物，其营养类型属于（）。

A.光能自养型

B.光能异养型

C.化能自养型

D.化能异养型

(单位：千人)

2010年的在校生中，工学学生所占的比例约是（）。

A.15％

B.20％

C.34％

D.40％