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【单选题】
（）是安全施工的“三宝”之一，是一种最常见的群体防护装备，挂设在脚手架或建筑物、构筑物的临空侧。A.
安全网
B.
安全帽
C.
安全带
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反馈参考答案：
举一反三
【简答题】汽车的行驶阻力包括滚动阻力、空气阻力、加速阻力和上坡阻力,其中( )和( )是在任何行驶条件下均存在的。
【单选题】What does the author tell us about Dr. Granich and his collegues and their trials?
A.
They use data from some African countries and other poor countries.
B.
They want to find out whether the alternative approach can function.
C.
The first-line antiretroviral drugs are effective in curing patients.
D.
Their study is to let the patients have no symptoms of AIDs.
【单选题】正足背踢球的后摆动作,主要是通过踢球腿下肢向后方摆动( )
A.
增大工作距离，使髋关节伸肌、膝关节屈肌能大幅度收缩
B.
踢球
C.
增大工作距离，预先使屈髋伸膝肌群拉长，以增大肌力
D.
以维持人体的平衡
【简答题】汽车的行驶阻力包括 、 、 和 等。
【单选题】Is there no end to the Drug Plague? Last year, our nation's capital passed the murder-a-day mark, and the number of homicides is now up some 50 percent from that level. More than half of these killing...
A.
There Is No End to the Drug Plague
B.
Let's Get Tough with Drug User
C.
We Must Crack Down on Drug Supplies
D.
Everyone Is A Victim of Drug Use
【单选题】Is there no end to the Drug Plague? Last year, our nation’s capital passed the murder-a-day mark, and the number of homicides is now up some 50 per cent from that level. More than half of these killin...
A.
There Is No End to the Drug Plague
B.
Let’s Get Tough with Drug User
C.
We Must Crack Down on Drug Supplies
D.
Everyone Is A Victim of Drug Use
【简答题】汽车的行驶阻力包括滚动阻力、空气阻力、加速阻力和（）阻力。
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