方程(x-1)(x-2)＝k2的一个根大于1，另一个根小于1。
(1)是＞5
(2)k＜10
A. 条件(1)充分，但条件(2)不充分。
B. 条件(2)充分，但条件(1)不充分。
C. 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分。
D. 条件(1)充分，条件(2)也充分。
E. 条件(1)和(2)单独都不充分，条件(1)和条件(2)联合起来也不充分。
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A．crowdedB．vacantC．lonelyD．alone
A. crowded
B. vacant
C. lonely
D. alone
According to Doi,
A. the overall effectiveness of the detection technology has improved.
B. Nissan is making a timetable to market the detection system.
C. it is impossible to improve the overall effectiveness of the detection system.
D. Nissan aims to improve the detection technology to reduce the fatality rate.
从一笔交易的出口商品换汇成本中可看出，在这笔交易中用多少人民币换回1美元，从而得出这笔交易为盈利还是亏损。()
A. 正确
B. 错误
The country's strongest earthquake took place in London in 1580.
A. Right
B. Wrong
C. Not mentioned
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