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【单选题】
临床用蜡制作蜡型后,室温放置其形状会逐渐变化,其原因是A.
热胀冷缩
B.
蠕变
C.
应力松驰
D.
应变
E.
材料的弹性恢复
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【简答题】用科学记数法表示下列各数： （1）天文学上常用太阳和地球的平均距离作为一个天文单位，1个天文单位约为149600000千米； （2）某种病毒细胞的直径约为0.00000042米； （3）3.3是3 的近似值，3.3与3 相差多少？（精确到千分位）
【多选题】((2020·无锡期末)化合物Y具有保肝、抗炎、增强免疫等功效,可由X制得。下列有关化合物X、Y的说法正确的是
A.
一定条件下X可发生氧化、取代、消去反应
B.
1 mol Y最多能与4mol NaOH反应
C.
X与足量H 2 反应后,每个产物分子中含有8个手性碳原子
D.
等物质的量的X、Y分别与含足量Br 2 的溴水反应,最多消耗Br 2 的物质的量相等
【单选题】当输电线路因为故障而引起断路器跳闸后,能够自动迅速地将线路断路器重新强行合闸的装置称为自动重合闸装置,简称为( )装置。
A.
AAT
B.
TV
C.
ARC
D.
ARI
【简答题】About one year ago, a couple with three children moved into the apartment next door to me. I never heard any noise form the children, but I often heard the parents shouting at the kids, not in a nice ...
【单选题】A company that produces racing motorbikes has several models that sell well within the motorcycle racing community and which are very profitable for the company. Despite having a profitable product, w...
A.
Profits from the sales of popular models will be lost when returned to the shareholders in the form of dividends.
B.
New models will require a lot of money to develop and bring to market before they generate any revenue.
C.
The company will have built up debts which must be repaid in order to bring the current models to market.
D.
Equity must be raised to finance the development of new models to replace the existing models.
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