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【单选题】
蔗糖水解的动力学实验中，为了测定蔗糖或葡萄糖、果糖浓度的变化，可用物理法，选用的测量仪器是（）。A.
电导仪
B.
旋光仪
C.
酸度计
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举一反三
【简答题】Fires may do more damage than the earthquakes(地震).
【单选题】The kind of humor I like is the thing ________ makes me laugh for five seconds and think for ten minutes.
A.
． that
B.
． /
C.
． what
D.
． it
【简答题】A．They lived in large groups. B．They used sand as insulation. C．They kept fires burning constantly. D．They faced their homes toward the sourth.
【单选题】Large volumes of carbon dioxide are safe and effective for fighting fires in enclosed spaces, such as in a pumproom, provided that the ______.
A.
persons in the space wear gas masks
B.
persons in the space wear damp cloths over their mouths and nostrils
C.
ventilation system is secured and all persons leave the space
D.
ventilation system is kept operating
【简答题】The prive measures for forest fires include some preemptive(抢先)methods that can help reduce the risks of fires and control their severity and spread，and thus, maintain ecological balance and prot...
【单选题】—What can I do for you, sir ? —I want to buy a flat—large, comfortable and ________ at the seaside.
A.
in all
B.
after all
C.
above all
D.
first of all
【简答题】A．They lived in large groups. B．They used sand as insulation. C．They kept fires burning constantly. D．They faced their homes toward the south.
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