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【单选题】
With the introduction of the electronic computer, there are no complicated problem ______ can be solved.A.
that
B.
as
C.
but
D.
which
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举一反三
【单选题】On Buy Nothing Day, people are encouraged ________anything.
A.
not to buy
B.
to buy
C.
not buy
D.
buy
【单选题】有一个边长为【图片】的均匀裸立方体堆，堆内热中子通量密度为：【图片】若堆芯内的扩散系数为0.84cm，扩散长度为17.5cm，则单位时间内整个堆芯被吸收的热中子数为___________【图片】个。（结果精确到小数点后4位有效数字）
A.
127.0115
B.
7.2468
C.
72.468
D.
8.6402
【单选题】The best title for the passage might be ______.
A.
Buy Nothing Day in the U.S.
B.
The Future of Buy Nothing Day
C.
Free Dinners on Buy Nothing Day
D.
Students'Activities on Buy Nothing Day
【简答题】有一个边长为【图片】的均匀裸立方体堆，堆内热中子通量密度为【图片】。若堆芯内的扩散系数为0.84cm，扩散长度为17.5cm，则单位时间内整个堆芯内被吸收的热中子数为___________【图片】个。（结果精确到小数点后4位）
【简答题】有一个边长为【图片】的均匀裸立方体堆，堆内热中子通量密度为：【图片】若堆芯内的扩散系数为0.84cm，则单位时间内从堆芯泄漏的中子数为________【图片】【图片】个。（结果精确到小数点后4位）
【单选题】If you can make photographs, what can you do to enhance your skills?
A.
Enter photo competitions.
B.
Take as many photos as possible.
C.
Take a community college class.
D.
Learn from other photographers.
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