【名词&注释】
肺泡表面活性物质(pulmonary surfactant)、肺泡表面张力(alveolar surface tension)
[单选题]肺泡回缩力主要来自( )
A. 肺弹性纤维与肺泡表面张力
B. 肺泡表面液体分子层
C. 肺泡表面活性物质与肺弹性纤维
D. 肺弹性纤维
E. 肺泡表面活性物质
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学习资料:
[单选题]He seems_______ from this university.
A. graduating
B. beinggraduated
C. to graduate
D. to havegraduated
[单选题]He will get everything ready_________three days.
A. after
B. for
C. in
D. since
[单选题]设集合M={X∈R|X≤-1},集合N={∈R|Z≥-3},则集合MnN=( )
A. {X∈R|一3≤X≤-1}
B. {Z∈R|Z≤-1}
C. {X∈R|X≥一3}
D. φ
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