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【简答题】
某公司购买了一台机器, 原始成本为12 000元, 估计能使用20年, 20年末的残值为2000元. 运行费用固定为每年800元, 此外每使用5年后必须大修一次, 大修理费用每次2800元. 试求机器的等值年费用, 利率为12%.
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【简答题】根据对称性可将品体分为____个对称型。____个晶系,____个品族。
【简答题】正常人体血浆渗透压为 __________,相当于血浆渗透浓度为__________。
【单选题】移动支付发展指数 China's mobile payment index was 197.84 in 2018 and the scale of China's digital economy reached 31.3 trillion yuan in the same year, accounting for 34.8 percent of the county's GDP. Shanghai...
A.
mobile payment index
B.
moving payment indicator
【单选题】In ancient times most cultures and civilizations made some reference to the origin of their languages. However, they did not study language by observation or experimentation - at least as far as we ca...
A.
the first word a child is able to utter in any language is 'bread'.
B.
the Phrygian language was the oldest language of mankind.
C.
the earliest word in any language is that for 'bread'.
D.
the Phrygian language was a language spoken in Asia Minor.
【简答题】喷嘴温度和料筒最高温度之间的关系是?为什么?
【单选题】基因型为Mm的动物，在其精子形成过程中，基因MM、mm、Mm的分开，依次分别发生在 ①精原细胞形成初级精母细胞 ②初级精母细胞形成次级精母细胞 ③次级精母细胞形成精子细胞 ④精子细胞形成精子 [ ]
A.
①②③
B.
③③②
C.
②②②
D.
②③④
【简答题】In ancient times wealth was measured and exchanged in things that could be touched: food ,tools, and previous metals and stones. Then the barter system was replaced by coins, which still had real valu...
【简答题】正常人体血浆渗透压为____,相当于血浆渗透浓度为____。
【单选题】基因型为Mm的动物，在其精子形成过程中，基因MM、mm、Mm的分开，分别发生在 ①精原细胞形成初级精母细胞 ②初级精母细胞形成次级精母细胞 ③次级精母细胞形成精细胞 ④精细胞变形成精子 [ ]
A.
①②③
B.
③③②
C.
②②②
D.
②③④
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