1 | 2 | 3 | 4 | 5 | 6 | 7 |
D | C | B | B | B | D | D |
8 | 9 | 10 | 11 | 12 | 13 | |
D | B | D | D | C | D |
15. (1)N:H:C:O=14:5:12:48
(2)虚假;中氮元素含量为14/79×100% =17.7%
(3)放在阴凉干燥的地方,防止受热
(4)碱
(2)酸
(3)混合时产生氨气,导致肥效降低
(2)硝酸;气泡;硝酸银溶液;氯化铵;氯化钡;硫酸钾;