高压加热器出水电动门联锁关闭的条件是(),同时()。
参考答案:高加解列、高加进水液控阀关闭
一列火车上午8时从甲站开出,到第二天的晚上9时到达乙站.已知火车平均每小时行98千米.甲乙两站间的铁路长多少千米?
An analyst does research about security market indices. Which of the following indices is most likely subject to survivorship bias()
A. Fixed-income indices.
B. Hedge fund index.
C. Real estate investment trust index.