period meter [核] 周期计 ; 反应堆周期计 ; 反应器〕周期计
nuclear reactor period meter 核反应堆周期测定仪
reactor-period meter 反应堆周期测量计
reactor period meter 反应器周期计
period meter for reactor [核] 反应堆周期仪
analogue period meter 模拟式周期计
So a pendulum one meter long has a period of about two seconds.
因此1米长的钟摆，所用周期是2秒。
In Beijing, the average price of a newly-constructed unit dropped to less than 20-thousand yuan per square meter, more than 10 percent lower than the same period last year.
在北京，一个新建单位平均价格降到每平方米低于2万元，比去年同期下降了10%。
However, the existing heat meters in the actual operation exposed the shortcoming of too much power which leads to the short using period of the meter.
但是，现有热量表的功耗过大，致使热量表使用周期过短，给用户带来了极大的不便。
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