A. [A] Steel manufacturing. B. [B] Coal mining. C. [C] Textiles. D. [D] Transportation.
A. [A] They were a fire hazard. B. [B] They were too spread out. C. [C] They were designed for efficiency rather than for beauty. D. [D] They were difficult to heat.
A. 低张性缺氧 B. 血液性缺氧 C. 循环性缺氧 D. 组织性缺氧 E. 混合型缺氧
A. 血液性缺氧 B. 低张性缺氧 C. 组织性缺氧 D. 淤血性缺氧 E. 缺血性缺氧
A. 90mmHg B. 60mmHg C. 80mmHg D. 50mmHg E. 70mmHg