自由学术的三个基本条件不包括（）A、有闲阶层的出现B、具备批判的传统C、对世界的惊异

以下反应最适合实验室制取氧气的是[ ]

A.2H₂O2H₂↑+O₂↑

B.2NH₄NO₃2N₂↑+O₂↑+H₂O

C.HgOHg+O₂↑

D.2KMnO₄K₂MnO₄+MnO₂+O₂↑

人们将网络层次结构模型和各层协议定义为网络的( )。

A．拓扑结构

B．开放系统互连模型

C．体系结构

D．协议集

妊娠期孕妇常见的心理社会变化，不包括（）。

A.矛盾

B.接受

C.自省

D.头晕、挑食

E.情绪波动

In your construction project, the CPI is 1.30 and SPI is 0.85. What could be the potential reason ？（）

A．A critical resource went on sick leave for a long period of time, which had not been anticipated earlie

B．The Cost of raw materials required for construction increased 10%.

C．You had not taken into account inflation rat

D．There was 4 days waiting time in the curing of cement, and work could not be done during that tim

喉血管瘤的治疗方法有（）

A.冷冻

B.激光

C.电灼

D.局部注射硬化剂

E.手术