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【简答题】
求 0.05 mol∙dm -3 KHC 2 O 4 溶液的 pH ,如果加入等体积的 0.1 mol∙dm -3 K 2 C 2 O 4 溶液后,则溶液的 pH 又为多少 ? ( K a1 ө = 5.9 × 10 -2 , K a2 ө = 6.4 × 10 -5 )
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【单选题】Who are the speakers talking about?
A.
A colleague.
B.
An office manager.
C.
A typist
【单选题】中国药典(2015年版)规定,乙醇未指明浓度时,是指浓度为
A.
100%(mL/mL)
B.
99.5%(mL/mL)
C.
95%(mL/mL)
D.
75%(mL/mL)
E.
50%(mL/mL)
【单选题】Who are the speakers?
A.
Salesman and customer.
B.
Manager and secretary.
C.
Nurse and patient.
【单选题】Who are the speakers?
A.
a. English majors.
B.
b. Senior students at college.
C.
c. Beginners in English study.
D.
d. Non-English majors at college.
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【单选题】Who are the speakers?
A.
Salesman and customer.
B.
Manager and secretary.
C.
Nurse and patient.