Which one of the followings cannot stop foreign particles from entering the respiratory system?
A. tiny cilia in the bronchial cells
B. rapid muscle contraction
C. bronchial tube constriction
D. enlargement of the chest
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_____are cells that can swallow up foreign particles in the bronchial tree.
A. platelets
B. erythroblasts
C. macrophages
D. epithelial cells
The measure of how easily the lungs expand under the pressure is _____
A. accommodation
B. compliance
C. spasm
D. resistance
数据库逻辑结构设计的基础是:
A. 物理设计
B. 概念设计
C. 流程设计
D. 数据设
系统设计报告的主要作用是作为什么的基础:
A.系统规划
B.系统分析
C.系统实施
D.系统评价