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单项选择题

参与制定建筑机械管理制度体现的机械员工作职责是（ ）。

A.机械管理计划
B.建筑机械前期准备
C.建筑机械安全使用
D.建筑机械成本核算
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单项选择题
It′s that time of the yea—graduation.The end of school year is nearly in sight,and it′s an especially big deal if?you′re finishing high school or college.
One amazing（令人惊叹的）16-year-old Florida girl,Grace Bush,graduated from both high school and college this week!She actually got her college diploma（毕业证书）before her high school diploma.How′d she do that?
"Hard work and dedication（专心致志）,"she told a local TV news station,"have made me succeed in doing high school and college at the same time."She started taking college courses when she was just 13.She would often?get up at 5:30 a.m.and not finish until after 11 p.m.
Doing both at once is a huge achievement,but it has also helped her family save money.She′s one of the 9?children,all home-schooled until the age of 13.Her father is a math professor while her mother is a part-time history?teacher in a high school.Grace Bush has earned her college degree in law,with a near perfect GPA of 3.8 and she?hopes to become a lawyer one day,although her parents expect her to teach at university.By the way,she also plays?basketball in her college team in her spare time.
Which of the following is the key to Grace′s success?
A.Takingcollegecoursesat13
B.Doinghighschoolandcollegeatthesametime
C.Beingborninaprofessor'sfamily
D.Beingdevotedtoherstudies
单项选择题
图像的尺寸和图像所占空间的大小成正比，图像尺寸越大所占空间越大
A、正确
B、错误
单项选择题
关于中心静脉压(CVP)，说法不正确的是()
A.是测定上、下腔静脉或右心房的压力
B.是评估血容量、右心负荷及右心功能的重要指标
C.CVP过高说明液体人量过多
D.使用呼吸机时可影响CVP
E.CVP低往往提示血容量不足
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