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【单选题】
当 300 K 时, 4.0 g dm -3 的聚氯乙烯溶液,其渗透压为 65.6kPa ,则聚氯乙烯的平均相对分子质量A.
1.5×10 5 g mol -
B.
1.5×10 3 g∙mol -1
C.
1.4×10 5 g∙mol -1
D.
1.4×10 3 g∙mol -1
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【单选题】Daniel gets meant and eggs from his chickens . He sells______eggs to his neighbors.
A.
his a few
B.
some these
C.
what any his
D.
a few of his
【简答题】What is the aim of English stylistics?
【单选题】He went to the market and bought __eggs and some meat.
A.
three dozen of
B.
three dozen
C.
three dozens
D.
three dozens of
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【简答题】He
went to the market and bought eggs and some meat.A. three
dozen of B. three
dozen C. three
dozens D. three
dozens of
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【单选题】219关于NH3分子描述正确的是( )。
A.
N原子采取sp2杂化，键角为l07.3
B.
N原子采取sp3杂化，包含一条d键三条丌键，键角l07.3
C.
N原子采取sp3杂化，包含一条d键二条Ⅱ键，键角l09.5
D.
N原子采取不等性sp3杂化，分子构形为三角锥形，键角107.3℃
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