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【判断题】
II型限制性内切酶的识别序列一般呈回文结构。A.
正确
B.
错误
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举一反三
【单选题】Both carbonic acid and glycine are diprotic, as they can give up ______ protons.
A.
one
B.
two
C.
three
D.
four
【单选题】Wendy: Have you been to the new bakery on the comer?Arthur: No, how is it?Wendy: It is heaven ! ______!
A.
Their cakes are to strive for
B.
Their cakes are to struggle for
C.
Their cakes are to die for
D.
Their cakes are to pay for
【单选题】The following curve may correspond to the titration of
A.
5.00mL of a 0.080 M diprotic acid, H 2 A prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
B.
5.00mL of a mixture consisting of 0.080 M H 2 A and 0.080 M HA − prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
C.
5.00mL of a mixture consisting of two acids with the same K a , 0.080 M HA, and 0.16 M HB prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
D.
5.00mL of a mixture consisting of two acids with thesame concentration (0.080 M), but different Ka
【单选题】下列不属于新贸易保护主义政策特点的是( )
A.
组成货币集团，瓜分世界市场
B.
限制进口措施的重点从关税转向非关税
C.
贸易保护的重心从限制进口转向鼓励出口
D.
贸易保护日益系统化、合法化
【简答题】小肠的运动形式有哪些?在消化过程中起何作用?
【单选题】A diprotic acid, H 2 A, has the following ionization constant: K a1 =1.1 × 10 -3 and K a2 =2.5 × 10 -6 ,To make up a buffer solution of pH 5.80 ,which combination would you choose?
A.
Na 2 A/NaHA
B.
NaHA/H 2 A
C.
Na 2 A/H 2 A
D.
NaHA
【单选题】Wendy: Have you been to the new bakery on the corner?Arthur: No, how is it?Wendy: It is heaven ! ______!
A.
Their cakes are to strive for
B.
Their cakes are to struggle for
C.
Their cakes axe to die for
D.
Their cakes are to pay for
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