【简答题】中和热测定实验中，下列操作一定会降低实验准确性的是 A 用滴定管（精量仪器，读数保留到0.01）取所用酸碱溶液的体积 B  NaOH溶液在倒入小烧杯时，有少量溅出 C、大、小烧杯体积相差较大，夹层间放的碎泡沫塑料较多 D、测量HCl溶液的温度计用水洗净后才用来测NaOH溶液的温度

【单选题】The Babylonians ___4___ just such a material.

【单选题】中和热测定实验中，下列操作一定会降低实验准确性的是（　　）

【简答题】阅读理解。 We've used the wind as an energy source for a long time. The Babylonians and Chinese were using wind power to pump water for irrigating crops 4,000 years ago, and sailing boats were around long ...

【判断题】在微型计算机系统中,鼠标属于输入设备。

【单选题】用NaOH滴定HCl时，准确量取一定体积HCl的量器是

【简答题】There are records of fingerprints taken many centuries ago. The ancient Babylonians pressed the tips of their fingerprints into clay to record business trade. The Chinese used ink-on-paper finger impr...

【单选题】中和热测定实验中,下列操作一定会降低实验准确性的是(　　)

【简答题】指出在下列情况下,各会引起哪种误差 砝码被腐蚀; 天平的两臂不等长; 容量瓶和移液管不配套; 试剂中含有微量的被测组分; 称量开始时天平零点未调; 读取滴定体积时最后一位数字估计不准; 滴定时不慎从锥形瓶中溅出一滴溶液; 标定HCl溶液用的NaOH标准溶液中吸收了 CO 2 ; 天平零点突然有变动; 称量时试样吸收了水分; 重量法测量 SiO 2 时,试样中硅酸沉淀不完全; 用NaOH滴定HAc,...

【单选题】In predicting eclipses, the Babylonians were restricted by their