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【单选题】
N2-的键级是A.
3
B.
2
C.
1
D.
2.5
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【单选题】What is reported about the crew of the ship?
A.
the captain was injured
B.
the chief engineer was injured
C.
all the crew were kidnapped
D.
six of the crew were kidnapped
【单选题】铜板上铁铆钉处的吸氧腐蚀原理如图所示，下列有关说法中，不正确的是( )
A.
此过程中铜并不被腐蚀
B.
此过程中电子从Fe移向Cu
C.
正极反应式为：2H ＋ ＋2e － =H 2 ↑
D.
此过程中还涉及反应：4Fe(OH) 2 ＋2H 2 O＋O 2 =4Fe(OH) 3
【多选题】铜板上铁铆钉处的吸氧腐蚀原理如图所示，下列有关说法正确的是 [ ]
A.
正极的电极反应式为：2H + +2e - =H 2 ↑
B.
此过程中还涉及反应：4Fe(OH) 2 +2H 2 O+O 2 =4Fe(OH) 3
C.
此过程中Fe、Cu均被腐蚀
D.
此过程中电流从Cu流向Fe
【单选题】铜板上铁铆钉处的吸氧腐蚀原理如右图所示， 下列有关说法正确的是
A.
正极电极反应式为：2H + +2e - =H 2 ↑
B.
此过程中还涉及到反应：4Fe(OH) 2 +2H 2 O+O 2 =4Fe(OH) 3
C.
此过程中Fe、Cu均被腐蚀
D.
此过程中电流从Fe移向Cu
【单选题】Authority gradient is an important factor that can have an effect on communication in a multi-crew environment. In a flight crew, an apt arranging is( )
A.
the captain's power, ability, longevity and status are higher much more than the other members of the flight crew.
B.
the captain's power, ability, longevity and status are equal to the other members of the flight crew.
C.
the captain's power, ability, longevity and status is higher than the other members of the flight crew in some short
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