The tellers in Mrs. Vaughts bank were told to ________.
A. explain why they could not pay out all accounts
B. pay out accounts as requested
C. make the depositors believe that the bank was stand
D. pay out money as slowly as possible
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某地区近地面气温是32℃,这里对流层的厚度为16.8㎞。按一般规律,此时该地对流层顶的气温应是()
A. -100.8℃
B. -68.8℃
C. -132.8℃
D. -42.8℃
In recent years, computers are being made _______.
A. larger and more expensive
B. smaller and cheaper
C. more difficult to use
D. to work more slowly
比色分析中滤光片的作用是______,它与有色溶液的关系是______,对同一种溶液选不同的滤光片时其吸光度值____
一定量的KHC2O4·H2C2O4·2H2O作为还原剂和作为酸时,消耗的KMnO4和NaOH的物质的量之比为n(KMnO4):n(NaOH)=______。