概算定额是确定完成合格的单位( )所需消耗的人工、材料和机械台班的数量标准。
A. 分项工程和结构构件
B. 扩大分项工程和扩大结构构件
C. 单位工程
D. 单项工程
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维生素C严重缺凡时会引起（）
A. 坏血病
B. 脚气病
C. 癞皮病
D. 夜盲症
成人骨骼和牙齿中的钙约占体内钙总量的（）
A. 69%
B. 79%
C. 89%
D. 99%
The Senate and the House of Representatives are the part of the political system of______.
A. Britian
B. Germany
C. France
D. America
According to the passage, it has been suggested that the science of human relations was slow to develop because______.
A. intuitive knowledge of human relations is derived from philosophy
B. early scientists were more interested in the physical world
C. scientific studies of human relations appear to investigate the obvious
D. the scientific method is difficult to apply to the study of human relations
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