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【单选题】
外汇 交割是指 ( )。
A.
本币和外币持有者相互交换货币所有权的行为,也就是外汇买卖中外汇的实 际收支活动.
B.
本币和外币所有者相互交换货币所有权的行为,也就是外汇买卖中外汇的实 际收支活动.
C.
本币和外币经营者相互交换货币所有权的行为,也就是外汇买卖中外汇的实 际收支活动.
D.
本币和外币持有者与银行相互交换货币所有权的行为,也就是外汇买卖中外 汇的实际收支活动.
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A.
Interrupt service routine
B.
Counter word register
C.
Execution unit
D.
control unit
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A.
A gloomy day.
B.
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C.
A black gallows.
D.
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【单选题】X线束成为混合射线的原因是 ( )
A.
高速电子接近原子核,电子丢失能量而减速
B.
固有滤过材料不同
C.
靶物质的材料不同
D.
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E.
由于康普顿效应所致
【单选题】X 线束成为混合射线的原因是( )
A.
阴极产生的电子获得的能量不同
B.
固有滤过材料不同
C.
靶物质的材料不同
D.
是光电效应所致
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