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一质量未知的托盘挂在弹簧上，如图所示，当盘上放一质量为m11；当盘上放一质量为m22。则弹簧的刚性系数K为()。

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听力原文： A passenger jet headed for New York City was forced to land at Halifax, Canada this morning. The plane's transponder was broadcasting a signal indicating it had been hijacked. The Virgin Atlantic flight from London's Heathrow Airport was midway across the Atlantic when air traffic control officials in the US started receiving its signal: a signal which carried a special code indicating them was a hijacking in progress. Canadian fighter jets operating under NORAD, the joint Canada-US command, were scrambled to intercept the jet. According to NORAD, the pilots of the passenger jet repeatedly radioed in to tell controllers they were not being hijacked. But US officials erred on the side of caution. After the plane landed, armed police boarded it to ensure there were no hijackers. It was determined that the plane's transponder had mal-functioned, and was mistakenly transmitting code "7500" for hijacking.
Why the passenger jet was forced to land at Halifax, Canada？

A. Some passengers would get off the plane in Canada.
B. There was something wrong about the plane and it could not fly again.
C. Because there were criminals on the jet plane. '
D. Because it had been thought that the jet had been hijacked.

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计算基金资产总值时，基金拥有的未上市股票、认股权证按其成本计算。()

A. 正确
B. 错误

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一般情况下，基金份额价格与资产净值呈反向关系，即资产净值增长，基金价格降低。尤其是开放式基金，其基金份额的申购或赎回价格都直接按基金份额资产净值来计价。()

A. 正确
B. 错误

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Which of the following words applying to any date or period in the credit referring to shipment will be understood to exclude the date mentioned？ ().

A. to
B. till
C. after
D. from

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