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The reason is that the compiler decided to allocate the backing store。关于这个话题,爱思助手下载最新版本提供了深入分析
提姆·多格特(Tim Doggett)是英國化學企業協會(Chemical Business Association)的執行長,該協會代表從製造商到分銷商、運輸商與貿易商的整個化學品供應鏈,他同時也是英國貿易協會論壇(Trade Association Forum)的董事。
Guar gum, a plant colloid, costs less than agar and is better suited for growing thermophilic bacteria, but is also more difficult to handle, being more viscous and less transparent. The bacterial polysaccharide xanthan is cheaper as well but forms weaker jellies that, as with carrageenan, might result in puncturing its surface. Other colloids, like alginate (from brown seaweed) and gellan gum (from a bacterium), don’t set solely based on temperature and require additives for gelation. These additives might interfere with microbial growth and make the preparation of those jellies less handy than agar plates.