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【单选题】
他得在规定的时间内做出决定。A.
He has to make a decision within a given period.
B.
He has to make a decision within a gave period.
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举一反三
【单选题】According to the research of Yale and the University of Pittsburgh,
A.
there was a link between a company's success and the personality of its boss.
B.
There was no connection between a firm's success and its boss's personality.
C.
people could judge a professor's ability by watching short film-clips of lecturing.
D.
people could judge a professor's ability only after attending lectures for a full semester.
【单选题】The overall purpose of this passage is to______
A.
demonstrate the cultural differences between America and Europe
B.
indicate ways to improve the American image abroad
C.
describe the general impression of foreign visitors on America
D.
criticize some behaviors of American taxi drivers
【单选题】欲配制pH=9．00的缓冲溶液，最好选用下列缓冲系中的( )。
A.
邻苯二甲酸(pKa1Θ=2．89；pKa2Θ=5．51)
B.
氨水(pKbΘ=4．75)
C.
甲胺盐酸盐(pKaΘ=10．63)
D.
硼酸(pKaΘ=9．14)
【单选题】欲配制pH=9．00的缓冲溶液，最好应选用( )。
A.
NaHCO3一Na2CO3
B.
NaH2PO4一Na2HPO4
C.
HOAc—NaOAc
D.
NH3.H2O—NH4Cl
【单选题】The distinciton between langue and parole was made by ________.
A.
Saussure
B.
Jacobson
C.
Halliday
D.
Chomsky
【单选题】欲配制pH=9.00的缓冲溶液,最好选用下列缓冲系中的( )
A.
Na 2 CO 3 -NaHCO 3
B.
NH 4 Cl-NH 3
C.
Na 2 HPO 4 -NaH 2 PO 4
D.
HCOONa-HCOOH
【简答题】日暮乡关何处是? 。
【单选题】欲配制 pH=9.00 的缓冲溶液,最好应用的是
A.
NaHCO 3 -Na 2 CO 3
B.
NaH 2 PO 4 -Na 2 HPO 4
C.
HAc-NaAc
D.
NH 3 ·H 2 O-NH 4 Cl
【单选题】欲配制pH=9.00的缓冲溶液,最好应选用
A.
NaHCO 3 -Na 2 CO 3
B.
NaH 2 PO 4 -Na 2 HPO 4
C.
HAc-NaAc
D.
NH 3 . H 2 O–NH 4 C l
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