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高频RFID系统典型的工作频率是 [填空(1)] 。 A. 13.56MHZ
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【单选题】China adopted the practice of( )in customs clearance following the establishment of a new clearance system for goods subject to inspection and quarantine on 1 January lst 2000.
A.
customs declaration before quarantine inspection
B.
customs declaration and quarantine inspection at the same time
C.
quarantine inspection before customs declaration
D.
none of them
【简答题】选做题：如下图，已知直线l 1 ∥l 2 ，直线l 3 和直线l 1 、l 2 交于点C和D，在C、D之间有一点P，如果P点在C、D之间运动时，问∠PAC，∠APB，∠PBD之间的关系是否发生变化。若点P在C、D两点的外侧运动时（P点与点C、D不重合），试探索∠PAC，∠APB，∠PBD之间的关系又是如何？
【单选题】China adopted the practice of ( ) in customs clearance following the establishment of a new clearance system for goods subject to inspection and quarantine on January 1st 2000.
A.
customs declaration before quarantine inspection
B.
customs declaration and quarantine inspection at the same time
C.
quarantine inspection before customs declaration
D.
none of them
【单选题】(4) China adopted the practice of ( ) in customs clearance following the establishment of a new clearance system for goods subject to inspection and quarantine on January 1st 2000.
A.
customs declaration before quarantine inspection
B.
customs declaration and quarantine inspection at the same time
C.
quarantine inspection before customs declaration
D.
none of them
【单选题】China adopted the practice of ( ) in customs clearance following the establishment of a new clearance system for goods subject to inspection and quarantine om January 1st 2000.
A.
customs declaration before quarantine inspection
B.
customs declaration and quarantine inspection at the same time
C.
quarantine inspection before customs declaration
D.
none of them
【单选题】设光敏电阻GM20539在10lx的光照下的阻值为50K，且已知它在10~100lx范围内的【图片】。试求该光敏电阻在90lx光照下的阻值（）
A.
8621.4
B.
862.14
C.
86.214
D.
8.6214
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