使用防护热板法双试件装置时，两个试件的冷板温差的差异不应大于（）。
A、1%
B、2%
C、3%
D、5%
参考答案：B
—You see, “Food Safety” receives thousands of Internet hits a day.
—Obviously, it has become one of the________ topics recently.
A．interesting
B．hot
C．most interesting
D．hottest
踽踽独行jǔ jǔ dú xíng
