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【单选题】
患者男性，76岁。高热，咳嗽4天来院。入院后第2天出现呼吸困难，胸片示双肺透亮度降低，感染治疗患者症状无改善，呼吸困难进一步加重，呼吸40次／分，胸片显示双肺呈“白肺”，血气分析示pH7.35，PaO50mmHg，PaCO80mmHg，考虑并发ARDS，行机械通气治疗。患者应用呼吸机其最佳通气模式是（）A.
正压通气
B.
压力支持通气
C.
同步间歇指令通气
D.
控制通气
E.
持续气道通气
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举一反三
【单选题】— Excuse me, where is Suguo Supermarket, please? — Take the No. 108 bus and ______ at the fourth bus stop.
A.
get on
B.
get off
C.
get up
D.
get to
【单选题】—— Here ____！ Where is Xiao Liu？ ---- There ____.
A.
comes the bus， is he
B.
the bus comes， he is
C.
comes the bus, he is
D.
the bus comes, is he
【单选题】A foreigner asked me,“Can you tell me where the nearest bus station is?”
A.
A foreigner asked me _______.
B.
if I can tell her where the nearest bus station is
C.
if I could tell her where the nearest bus station was
D.
if can I tell her where is the nearest bus station
E.
if could I tell her where was the nearest bus station
【单选题】真核生物复制子有下列特征,它们
A.
比原核生物复制子短得多，因为有末端序列的存在
B.
比原核生物复制子长得多，因为有较大的基因组
C.
全部立即启动，以确保染色体的 S 期完成复制
D.
通常是双向复制且能融合
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