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【单选题】
鼠伤寒沙门菌D55℃=10，是指A.
在55℃10秒钟可杀死食品中90%鼠伤寒沙门菌
B.
在55℃10分钟可杀死食品中90%鼠伤寒沙门菌
C.
在55℃10秒钟可减弱食品中90%鼠伤寒沙门菌
D.
在55℃10分钟可减弱食品中90%鼠伤寒沙门菌
E.
在55℃10分钟食品中90%鼠伤寒沙门菌不能繁殖
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【简答题】光合滞后期(lag phase of photosynthesis)
【单选题】In Figure 2, at which of the following wavelengths does the rate of photosynthesis exceed the rate of photosynthesis at 670 nm ?
A.
400 nm
B.
430 nm
C.
630 nm
D.
700 nm
【简答题】光合“午睡现象”(midday depression of photosynthesis)
【单选题】My mom __ in her eyes when she waved me goodbye.
A.
have tears
B.
did have tears
C.
did has tears
D.
did tears
【单选题】The photosynthesis by ancient microbes is an example of ______.
A.
the change of Earth
B.
the long history of Earth
C.
the life's influences on Earth
D.
the power of sunlight
【简答题】photosynthesis光合作用
【单选题】There the mother waved goodbye to her daughter until the train was ______________.
A.
out of sight
B.
out of reach
C.
out of order
D.
out of date
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