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【单选题】
以下哪一项不是重症肺炎的诊断标准之一？A.
呼吸频率≥30次/分
B.
感染性休克，须使用血管升压药物
C.
需要有创性机械通气
D.
PaO2/FiO2 值≤200mmHg
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举一反三
【简答题】(individual) the teacher has to give at least ten minutes to each student__________.
【单选题】液压传动系统中的辅助装置有（ ）。 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
压力控制阀
B.
液压缸
C.
方向控制阀
D.
压力表
【单选题】Which of the following statements about the changing nature of jobs in today's workplace is most accurate? ( )
A.
In many companies teams complete special projects and then disband.
B.
The primary employers in today's economy are large businesses.
C.
Employers prefer hiring people for jobs with narrow descriptions.
D.
Jobs are becoming less flexible and more permanent.
【单选题】It is on (each) individual effort (which) the safety and happiness of (the whole) (depend).
A.
each
B.
which
C.
the whole
D.
depend
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