有关肺通气阻力的叙述，下列哪项是错误的
A. 肺通气阻力可分为弹性阻力和非弹性阻力
B. 弹性阻力包括肺的和胸廓的弹性阻力
C. 非弹性阻力有气道阻力、惯性阻力和黏滞阻力
D. 平静呼吸时非弹性阻力是主要因素，约占总阻力的70%
The word "cuddle" in Par
A. 2 most probably means ______.A. persuadeB. hold close and lovelyC. threatenD. shout at
药物透皮吸收是指
A. 药物通过表皮到达深层组织
B. 药物主要作用于毛囊和皮脂腺
C. 药物在皮肤用药部位发挥作用
D. 药物通过表皮，被毛细血管和淋巴细胞吸收进入人体循环的过程
E. 药物通过破损的皮肤，进入人体内的过程
It can be inferred from the passage that by 1870 ______.
A. the steam engine had been invented
B. a national commission on agriculture had been established
C. the U.S. horse population was about 10 million
D. technology began to be more economical
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