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【单选题】
对能量为100KV的射线,铝的透照等效系数为0.08,则对于厚度25MM的铝试件,应选择多少厚度钢的暴光量()
A.
25mm;
B.
2mm;
C.
20mm;
D.
3mm。
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参考答案:
举一反三
【单选题】_____________ best friend is a girl. I often learn English with _____________. [     ]
A.
I, she
B.
My, her
C.
Mine, her
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A.
in
B.
on
C.
of
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A.
am
B.
is
C.
are
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【多选题】当流量阀为节流阀时,( )回路用于低速.轻载,且负载变化较小的液压系统。
A.
进油节流
B.
旁油节流
C.
回油节流
D.
A+B+C
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【单选题】当流量阀为节流阀时,( )回路用于低速.轻载,且负载变化较小的液压系统。
A.
进油节流
B.
旁油节流
C.
回油节流
D.
A或C
【判断题】1993年,别洛韦日国家森林公园进入教科文组织世界文化遗产名录。
A.
正确
B.
错误
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