题目内容

The students never_______that the teacher is planning a pop quiz.

A. set out
B. attend
C. suspect
D. refer to

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Some people will__under pressure, while a few people do well despite the pressure.

A. let down
B. set out
C. go up
D. fall apart

The narrow street is _______for the traffic jam.

A. famous
B. academic
C. numerous
D. notorious

下列物质(均为0.1 mol×L-1),不能用强碱标准溶液直接滴定的是:

A. HCOOH(pKa = 3.75)
B. HAc(pKa = 4.76)
C. H2SO4
D. NH4Cl(pKa = 9.25)

下列物质(均为0.10 mol×L-1),不能用强碱标准溶液直接滴定的是:

A. 一氯醋酸(Ka = 1.4×10-3)
B. 苯酚(Ka = 1.3×10-10)
C. 氟化氢(Ka = 3.5×10-4)
D. HAc(Ka = 1.8×10-5)

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