管道过热灯亮时(DUCTOVERHEAT),哪个过热电门闭合()。
A、190℉/88℃
B、210℉/99℃
C、250℉/121℃
D、390℉/199℃
参考答案:A
— Is my answer to the math problem right?
— Let me consider it carefully _____ I give you an answer. [ ]
A. before
B. after
C. since
D. as soon as
预测事件的变化主要不是受技术、收入等客观因素影响,而是受政策、方针、个人意志等因素影响时,宜采用( )。
A.类推预测法
B.弹性系数法
C.德尔菲法
D.专家会议法