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【判断题】
制冷剂中的热量,在蒸发器中的吸取和冷凝器中的释放都借助于风机A.
正确
B.
错误
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【简答题】solution is preapred by dissovling 35 g of hemoglobin(Hb) in enough water to make up one liter in volume. if the osmotic pressure of the solution is found to be 10 mmg at room temperature, calculate t...
【简答题】What are the assumptions of Beer’s law? 2. (1) Calculate the molar absorptivity of an yte if a 3.4×10 -4 mol/L solution of this chemical is placed in a sample cell with a path length of 5.0 cm and...
【单选题】A 5.00g quantity of a diprotic acid is dissolved in water and made up to exactly 250 mL.Calculate the molar mass of the acid if 25.0 mL of this solution required 11.1 mL of 1.00 M KOH for neutralizati...
A.
60.1 g/mol
B.
70.1 g/mol
C.
80.1 g/mol
D.
90.1 g/mol
【简答题】Calculate the molar mass of a compound if 0.372 mole of it has a mass of 152g.
【简答题】对于课本48页的三张表,要查询每门课程的课程名和平均成绩,下面能完成此查询的SQL语句是( )A. select cname,sum(grade) from C,SC group by cname; B. select cname,avg(grade) from C,SC where C.cno=SC.cno group by cname; C. select cname,avg(grade) ...
【简答题】A Solution containing 4.74 ug/L KMnO 4 has a transmittance of 0.309 in a 1.00 cm cell at 520 nm. Calculate the molar absorptivity of KMnO 4 .
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