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【单选题】
如图所示是一个做布朗运动的颗粒的运动路线。从颗粒在A点开始,每隔30s记录一下颗粒的位置,得到B、C、D、E、F等点,则颗粒在75s末时的位置是:A.
一定在CD连线的中点
B.
在CD连线上，在不一定在CD连线的中点
C.
一定不在CD连线的中点
D.
可能在CD连线上，也可能在CD连线以外的某点
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举一反三
【单选题】The chief cause of loss for the nursery crops before marketed may be _____________ .
A.
desciccation during storage
B.
warming during storage
C.
lacks of cold-storage facilities at retail outlets
D.
all of the above
【单选题】What's the public opnion about the nursery staff?
A.
They should focus on managing the parents.
B.
They should focus on caring for the children.
C.
They should send more reports to the nursery.
D.
They should send more pictures to the parents.
【简答题】What is a nursery in this passage?
【单选题】The ____ of new scientific discoveries to industrial production methods usually makes jobs easier to do.
A.
addition
B.
association
C.
application
D.
affection
【简答题】A．They had lost their jobs as a result of the Industrial Revolution. B．They had been suffering from political and religious oppression. C．They wanted to flee from the widespread famine in Northern Eur...
【单选题】Industrial ships are those whose function is to _________at sea.
A.
carry dry cargoes
B.
carry fluid cargoes
C.
carry passengers
D.
carry out an industrial process
【单选题】What is the environmental benefit of GM crops?
A.
Herbicidetolerant crops can reduce the use of chemicals.
B.
Herbicidetolerant crops can use milder chemicals.
C.
Bt genes can protect crops against insects instead of chemical pesticides.
D.
Insect-resistant crops only need a more benign mix of chemicals .
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