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【单选题】
膦(PH 3 )又称磷化氢，在常温下是一种无色、有大蒜臭味的有毒气体，电石气的杂质中常含有磷化氢。它的分子构型是三角锥形。则下列关于PH 3 的叙述正确的是 [ ]A.
PH 3 分子中有未成键的孤对电子
B.
PH 3 是空间对称结构
C.
PH 3 是一种强氧化剂
D.
PH 3 分子中的P-H键间夹角是90°
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【单选题】Which statement best describes OSPF external LSAs （type 5）？（）
A.
OSPF external LSAs are automatically flooded into all OSPF areas, unlike type 7 LSAs, which require that redistribution be configured.
B.
External LSAs (type 5) are automatically changed to type 1 LSAs at ASBRs.
C.
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D.
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【单选题】, contraindication(禁忌) of oral rehydration does not include
A.
shock
B.
mild dehydration, no vomiting.
C.
eyelid edema in children
D.
cardiac insufficiency
E.
obvious abdominal distension
【单选题】Contraindication(禁忌) of oral rehydration does not include
A.
shock
B.
mild dehydration, no vomiting.
C.
eyelid edema in children
D.
cardiac insufficiency
E.
obvious abdominal distension
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