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【简答题】
苯甲酸钠(C 7 H 5 O 2 Na)是一种食品添加剂,广泛用于食品工业中。请计算: (1)苯甲酸钠有________种元素组成; (2)C 7 H 5 O 2 Na相对分子质量是质量是________; (3)C 7 H 5 O 2 Na中碳、氧两种元素的质量比是________; (4)14.4g苯甲酸钠中含有钠元素的质量是________。
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【单选题】Kate green is her name, so her is Kate.
A.
last name
B.
given name
C.
family name
D.
give name
【单选题】Kate Green is her name, so her ___is Kate.
A.
last name
B.
give name
C.
family name
D.
given name
【单选题】—What's her name? — ____. [ ]
A.
She is a girl
B.
She is OK
C.
Her name is Kate Green
D.
She is Green
【多选题】关于离子通道的特点描述正确的是?
A.
离子通道具有门控性和选择性
B.
离子通道的选择性与通道直径和电荷有关
C.
离子通道内部为亲水性微孔
D.
离子通道外部为亲脂性残基
【简答题】阅读理解。 This is a picture of Kate Green's family. In the picture we can see her grandparents, her parents, her brother Mike and her. Her grandparents are on the chair. Mr. Green and Mrs. Green are behin...
【单选题】Mrs. Green is Kate's mother. Kate is her ______. [ ]
A.
daughter
B.
mother
C.
father
D.
son
【简答题】阅读理解。 Mrs. Green is going to give a birthday party for Kate. Kate is her daughter. Kate will be four years old. A lot of Kate's friends will come to the party. Mrs. Green will go shopping. She wil...
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