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【单选题】
()是保证精馏过程连续稳定操作的必要条件之一A.
液相回流
B.
进料
C.
产品采出
D.
产品提纯
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皮皮学刷刷变学霸
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【简答题】知觉思维(perception thinking)
【单选题】---Is it possible for you to lend me your car for a week? ---_______! You haven’t got your driving license yet!
A.
No wonder
B.
Not likely
C.
No problem
D.
Not exactly
【简答题】Which of the following signs means 'You mustn't stop your car here'? [ ]
【简答题】How often do you use your car? Can you use your car less often? Do you know the following facts in the UK? ? About 50% of all car journeys are just for fun. ? Over 80% people go to work by car. ? 25% ...
【简答题】（4分）下列实验操作中不正确的是______________（填序号）。 A．用托盘天平称取11.70g食盐 B．利用任何强酸和强碱溶液相互反应均可测得中和热为57.3kJ/mol C．用量筒量取12.36mL盐酸 D．用酚酞作指示剂进行中和滴定时，当溶液由无色变为红色时立即停止滴定 E．用酸式滴定管盛装高锰酸钾溶液进行相关滴定。
【多选题】TTL 门电路如图所示,其中可以实现 Y=0 的逻辑电路有: , 已知关门电阻 Roff=0.91k Ω,开门电阻 Ron=1.93k Ω。
A.
a
B.
c
C.
b
D.
d
【简答题】How often do you use your car? Can you use your car less often? Do you know the following facts in the UK? ? About 50% of all car journeys are just for fun. ? Over 80% people go to work by car. ? 25% ...
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