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【单选题】
相间短路时瞬时电流速断保护不能保护本线路全长，这是因为（ ）。A.
为了保证电流速断保护有足够的灵敏度
B.
为了保证电流速断保护的选择性
C.
为了保证电流速断保护的速动性
D.
保护装置的固有缺陷，无法将定值调整到线路全长的整定值
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【单选题】The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reported well over 100 in...
A.
a new rule for all airlines
B.
the defects of electronic devices
C.
a possible cause of aircraft crashes
D.
effective safety measures for air flight
【多选题】豈不穀是為?先君之好是繼!與不穀同好,如何? 对上句解释正确的是( )
A.
可以填翻译为：難道為了我？［只是為了］繼承先君的友好關係［罷了］。
B.
這是虛偽的外交辭令。
C.
不谷，不善， 諸侯的謙稱。
D.
兩個“是”字都是代詞，復指提前的賓語。
【单选题】The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reported well over 100 in...
A.
a new regulation for all airlines
B.
the defects of electronic devices
C.
a possible cause of aircraft crashes
D.
effective safety measures for air flight
【单选题】曲线C 1 的极坐标方程为：ρ=2sinθ，曲线C 2 的参数方程为： （t为参数），则C 1 和C 2 所表示的图形分别是 [ ]
A.
圆、直线
B.
直线、圆
C.
圆、圆
D.
直线、直线
【单选题】The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reported well over 100 in...
A.
a new regulation for all airlines
B.
the defects of electronic devices
C.
a possible cause of aircraft crashes
D.
effective safety measures for air flight
【单选题】The biggest safety threat facing today may not be a terrorist with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reported well over 100 incidents t...
A.
a new rule for all airlines
B.
the defects of electronic devices
C.
a possible cause of aircraft crashes
D.
effective safety measures for air flight
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