若要配制pH=8.54的NH4+—NH3缓冲溶液时,已知NH4+的解离常数为5.6×10-10,pKa为9.24,则NH4+与NH3的物质的量浓度之比为()
A. 2.0
B. 0.2
C. 1.0
D. 5
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Collectivism is a political system that stresses the primacy of__goals over __goals()
A. collective, individual
B. positive, negative
C. positive, individual
D. negative, collective
The couple__ never to work at the same time, so that one of them was always on full-time parenting duty, and their child wouldn’t have to be looked after by strangers()
A. made a pact
B. reach a compromise
C. appealed to
D. set a date
I was not only shocked but also disgusted that the report tried to ______ the scientific facts in such a manner that even some newly-educated people were fooled()
A. deduce
B. dye
C. disperse
D. distort
正手握拍时应()
A. 握拍手的虎口对准拍柄窄面內侧斜棱
B. 拇指內侧顶在拍柄內侧的宽面上
C. 中指、无名指和小指并拢握住拍柄
D. 以上都不对