___________ books do you have?[ ]
A. How much
B. How are
C. What's
D. How many
答案:D
动力黏度的单位符号为( )。
A.kPaB.Pa·sC.mm2/sD.cm-1E.μm
根据如图所示的硝酸钾溶解度曲线:
(1)在60℃时,100g水最多溶解硝酸钾的质量为______g;
(2)在相等质量的水中,要尽可能多的溶解硝酸钾,应选用______(选填“热水”或“冷水”).