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【多选题】
中药分析的主要研究内容包括以下哪些内容?(多选)A.
定性鉴别
B.
定量分析
C.
杂质检查
D.
浸出物检查
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举一反三
【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
【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
【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，正确的是（ ）
A.
此过程中铜被腐蚀
B.
此过程中电子从Fe移向Cu
C.
正极电极反应式为：2H + +2e - ═H 2 ↑
D.
铁钉表面发生的反应为Fe-3e - ═Fe 3+
【简答题】A．They would help the crew to get out of the desert. B．They would help the crew to have radio contact. C．They would help people to identify them. D．They would help the engineers to know what had befal...
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