虽影响设备出力和经济性，但不影响主机继续运行，由于受客观条件限制，在运行中暂时无法解决，必须在设备停运后才能解决的设备缺陷，称三类设备缺陷。
参考答案：错
One night all of his ________ signs began to drop sharply and the head teacher, who believe in
the concept that no one should die alone, began to call his family members to the hospital. [ ]
A. common
B. obvious
C. vital
D. ordinary
持有期收益率(HolDingPerioDReturn,HPR)是衡量持有某一投资工具一段时间所带来的总收益，它不包括()。
