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【简答题】
(12 分)右图是稀释浓硫酸实验的示意图。 ( 1)写出图中a、b两种仪器的名称: a , b 。 ( 2)b容器所盛的试剂是 (填 “水”或“浓硫酸”)。 ( 3)稀释时,若两种试剂添加顺序颠倒,将会发生 ( 4)在稀释浓硫酸过程中仪器a要 不断 。将浓硫酸滴在纸张、木材等物质上,能使其碳化,说明浓硫酸具有 性 。 ( 5)如果不慎有少量的浓硫酸沾到皮肤或衣服上应如何处理:
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【简答题】Going on holiday not only makes you feel good while you’re there, you also gain the health benefits for months, new research shows． Jetting off to destinations such as the Maldives cuts your blood pre...
【简答题】It can be learnt from the passage that the health benefits of exercise ________. A) are yet to be proved B) are to be further studied C) are self-evident D) are supported by scientific evidence
【简答题】取某水样 10.00ml加入0.0250mol/L重铬酸钾溶液10.00ml,回流后2h后,用水稀释至140ml,用0.1025mol/L硫酸亚铁铵标准溶液滴定,消耗22.80ml,同时做全程序空白,消耗硫酸亚铁铵标准溶液24.35ml,试计算水样中COD的含量。
【单选题】发动机在高转速时,气缸内燃烧过程所占的曲轴转角较大,且活塞、轴瓦等运动副的机械磨损损失( ),此时发动机( )产生最大转矩。
A.
增加，不能
B.
减少，不能
C.
减少，能
D.
增加，能
【简答题】Putting in water fountains(饮水器) at schools, and teaching children about the health benefits of water, could reduce their risk of getting extra pounds, reports a new study that is published in the late...
【单选题】It can be learnt from the passage that the health benefits of exercise. ( )
A.
are yet to be proved
B.
are to be further studied
C.
are supported by scientific evidence
D.
are self-evident
【单选题】下列项目中，不属于非货币性资产交换的是（ ）。
A.
以公允价值200万元的原材料换取一台设备
B.
以公允价值800万元的长期股权投资换取一批原材料
C.
以公允价值100万元的A车床换取B铣床，同时收到15万元的补价
D.
以公允价值74万元的电子设备换取一辆小汽车，同时支付26万元的补价
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