建立故障树的应注意的问题有()
A. 严格遵守循序渐进的原则
B. 正确选取顶事件
C. 准确写出故障事件方框中的说明
D. 正确划分每个事件方框的故障类型
Linesdrawnthroughpointsontheearthhavingthesameatmosphericpressureareknownas().
A. isothermal
B. millibars
C. isobars
D. seismics
Jimissorry()soimpolitetoyourguestlastSaturday.
A. tobe
B. being
C. havingbeen
D. tohavebeen
Itwasessentialthattheapplicationforms()backbeforethedeadline.
A. mustbesent
B. besent
C. wouldbesent
D. weresent