下列特种劳动防护用品中，不属于防护服类的是( )。
A. 防辐射工作服
B. 阻燃防护服
C. 防酸工作服
D. 防静电工作服
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How is the world different today (in 1961)
A. We can destroy each other.
B. We can travel quickly.
C. We can get rid of hunger.
D. We can fend for ourselves.
统计工作中常用的抽样方法是( )。
A. 随机抽样
B. 单纯随机抽样
C. 系统抽样
D. 整群抽样
The Smiths______ the Summer Palace three times.
A. have gone to
B. have been in
C. have been to
D. have gone into
成人大量血胸，出血量多( )
A. ＞300ml
B. ＞500ml
C. ＞1000ml
D. ＞1500ml
E. ＞2000ml
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