问题
单项选择题
将用绝缘电阻表测量的10min时的绝缘电阻与（）时的绝缘电阻相比，称为极化指数。
A.5s
B.15s
C.1min
答案
参考答案：C
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将用绝缘电阻表测量的10min时的绝缘电阻与（）时的绝缘电阻相比，称为极化指数。
A.5s
B.15s
C.1min
参考答案：C
Scientists say they have found key clues（线索）into how long we will live. One of them is a firm __21___. British researchers believe a firm strong handshake is not just a __22___ of confidence but also an indicator of a long life. Lead author Dr Rachel Cooper of University College London said her study looked __23___ 33 different reports on the __24___ of handshakes. The research involved more than 50,000 men and women and __25___ 40 years. Dr Cooper concluded that __26___ with weaker handshakes were 70 per cent more likely to die earlier than those with the __27___ handshakes. She concludes that people with a firm strong handshake __28___ from a happy childhood that __29___ a healthy diet and __30___ of exercise. The new study, __31___ in the British Medical Journal, also found other signs of living a longer life. These 'measures of __32___ capability' include walking at a faster pace, getting out of a chair quickly, and being able to __33___ on one leg. The study showed that slow walkers were almost three times __34___ to die at a younger age than those who walked quickly and actively. Those who __35___ to get up from their armchairs were twice as likely to die earlier than those who sprang __36___ their chairs. Dr Cooper believes there __37___ more research into the link __38___ physical capability and a long life. “Research that helps people to __39___ a long and healthy life is ever more important to help provide for an ageing __40___.” she said.
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