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【单选题】It’s widely accepted that young babies like to do things because certain acts lead to ________.
A.
rewards
B.
prizes
C.
awards
D.
results
【单选题】By saying that the 'blast wave' from the explosion acts like 'an invisible wall of energy', the author intends to say that ______.
A.
blast can cause shrapnel or other bits of metal to slice through flesh like a knife
B.
its energy can cause a swath of disfiguring burns
C.
this energy wall can prevent victims from physical injury and obvious bleeding
D.
its tremendous energy can inflict massive internal injuries
【单选题】沟槽开挖不正确的做法是( )
A.
机械挖槽时，应在设计槽底高程以上留不小于200mm的余量，待人工清理
B.
机械挖槽时，机械离沟槽伤口边缘应有一定的安全距离
C.
机械挖槽时，应由专人负责掌握挖槽断面尺寸和标高。
D.
采用起重机下管时，可在沟槽两侧堆土
【单选题】In the atmosphere, carbon dioxide acts rather like a one-mirror--the glass in the roof of a green-house which allows the sun' s rays to enter but prevents the heat from escaping. According to a weathe...
A.
prevent the sun' s rays from reaching the earth' s surface
B.
mean a warming up in the Arctic
C.
account for great changes in the climate in the northern hemisphere
D.
raise the temperature of the earth' s surface
【简答题】在Excel2007中,模板文件的扩展名为()。
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