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【单选题】
在间歇反应器中进行等温一级反应A→B，-r A =0.01C A mol/l.s，当C AO =1mol/l时，求反应至C A =0.01mol/l所需时间t=（）秒。A.
400
B.
460
C.
500
D.
560
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皮皮学刷刷变学霸
举一反三
【单选题】The Chinese people are busy _______ the Spring Festival now.
A.
preparing for
B.
to prepare for
C.
to prepare
【单选题】The early spring frost sweeping over the north area now is sure to cause ________ of fruits this year.
A.
liability
B.
invalidity
C.
scarcity
D.
novelty
【单选题】The Chinese people are busy _____ the Spring Festival now. [ ]
A.
to prepare for
B.
preparing for
C.
to prepare
【单选题】Just now a strange idea() in her mind.
A.
springed up
B.
sprang up
C.
sprung up
D.
spring up
【简答题】It ________ spring now.
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