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【单选题】
表面活性剂具有的结构特征是
A.
含有聚氧乙烯基团
B.
含有亲水基团
C.
含有疏水基团
D.
同时含亲水基团与亲油基团
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参考答案:
举一反三
【单选题】My father was born_______1964. He is forty years old. [     ]
A.
at
B.
on
C.
in
D.
to
【单选题】肉桂( )
A.
含晶薄壁细胞排列成行
B.
栓内层为石细胞环带
C.
射线细胞中含草酸钙针晶
D.
胶丝成条或扭曲成团
E.
纤维束周围薄壁细胞中含草酸钙方晶,形成晶纤维
【单选题】黄柏( )
A.
含晶薄壁细胞排列成行
B.
栓内层为石细胞环带
C.
射线细胞中含草酸钙针晶
D.
胶丝成条或扭曲成团
E.
纤维束周围薄壁细胞中含草酸钙方晶,形成晶纤维
【简答题】A.薄壁细胞中含大型草酸钙簇晶 B.薄壁细胞中含草酸钙砂晶 C.薄壁细胞中含草酸钙柱晶 D.薄壁细胞中含草酸钙针晶 E.薄壁细胞中含草酸钙方晶 甘草
【单选题】My father was born ___ 5th April ,1960 . [     ]
A.
in
B.
at
C.
on
D.
of
【单选题】My father was born _____September 20th,1970. [     ]
A.
at
B.
on
C.
of
D.
in
【单选题】厚朴( )
A.
含晶薄壁细胞排列成行
B.
栓内层为石细胞环带
C.
射线细胞中含草酸钙针晶
D.
胶丝成条或扭曲成团
E.
纤维束周围薄壁细胞中含草酸钙方晶,形成晶纤维
【单选题】一My father was born .When he was ,he went abroad.
A.
in 1970;in his thirty
B.
in the 1970s;in his thirties
C.
in the 1970;in his thirty
D.
in 1970s;in his thirties
【单选题】My father was born _________ 18th October,1970. [     ]
A.
in
B.
on
C.
at
D.
to
【单选题】下列各种细胞中,肯定不属于女性的是:
A.
含XX的肝细胞
B.
含XX的口腔上皮细胞
C.
含Y的生殖细胞
D.
含X的生殖细胞
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