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℃
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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)=______。
A.peasantB.presentC.promiseD.possession
A. peasant
B. present
C. promise
D. possession