下表是氯化铵在不同温度时的溶解度 <table style="BORDER-COLLAPSE: collapse; MARGIN-LEFT: 0.75pt" border="0" cellspacing="0" cellpadding="0" _dj="MsoNormalTable"><tbody><tr style="HEIGHT: 18.6pt"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1.5pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 77.55pt; PADDING-RIGHT: 0cm; HEIGHT: 18.6pt; BORDER-TOP: windowtext 1.5pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="103">温度/℃</td><td style="BORDER-BOTTOM: 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 77.35pt; PADDING-RIGHT: 0cm; HEIGHT: 18.6pt; BORDER-TOP: 1.5pt solid; BORDER-RIGHT: 1pt solid; PADDING-TOP: 0cm" width="103">20</td><td style="BORDER-BOTTOM: 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 77.85pt; PADDING-RIGHT: 0cm; HEIGHT: 18.6pt; BORDER-TOP: 1.5pt solid; BORDER-RIGHT: 1pt solid; PADDING-TOP: 0cm" width="104">40</td><td style="BORDER-BOTTOM: 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 78.3pt; PADDING-RIGHT: 0cm; HEIGHT: 18.6pt; BORDER-TOP: 1.5pt solid; BORDER-RIGHT: 1pt solid; PADDING-TOP: 0cm" width="104">60</td><td style="BORDER-BOTTOM: 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 78.55pt; PADDING-RIGHT: 0cm; HEIGHT: 18.6pt; BORDER-TOP: 1.5pt solid; BORDER-RIGHT: 1.5pt solid; PADDING-TOP: 0cm" width="105">80</td></tr><tr style="HEIGHT: 19.6pt"><td style="BORDER-BOTTOM: 1.5pt solid; BORDER-LEFT: 1.5pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 77.55pt; PADDING-RIGHT: 0cm; HEIGHT: 19.6pt; BORDER-TOP: medium none; BORDER-RIGHT: 1pt solid; PADDING-TOP: 0cm" width="103">溶解度/g</td><td style="BORDER-BOTTOM: 1.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 77.35pt; PADDING-RIGHT: 0cm; HEIGHT: 19.6pt; BORDER-TOP: medium none; BORDER-RIGHT: 1pt solid; PADDING-TOP: 0cm" width="103">40</td><td style="BORDER-BOTTOM: 1.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 77.85pt; PADDING-RIGHT: 0cm; HEIGHT: 19.6pt; BORDER-TOP: medium none; BORDER-RIGHT: 1pt solid; PADDING-TOP: 0cm" width="104">50</td><td style="BORDER-BOTTOM: 1.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 78.3pt; PADDING-RIGHT: 0cm; HEIGHT: 19.6pt; BORDER-TOP: medium none; BORDER-RIGHT: 1pt solid; PADDING-TOP: 0cm" width="104">58</td><td style="BORDER-BOTTOM: 1.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 78.55pt; PADDING-RIGHT: 0cm; HEIGHT: 19.6pt; BORDER-TOP: medium none; BORDER-RIGHT: 1.5pt solid; PADDING-TOP: 0cm" width="105">68</td></tr></tbody></table>据此数据，判断下列说法正确的是