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【多选题】
胃内食物的机械扩张和蛋白质消化产物的化学刺激对胃排空的作用是A.
抑制促胃液素的释放，抑制排空
B.
促进胃体收缩，促进排空
C.
促进胃收缩，促进排空
D.
增强幽门括约肌收缩，抑制排空
E.
综合效应是延缓胃排空
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【简答题】多肽链中氨基酸的 ( ) 称为一级结构,主要化学键 ( )
【单选题】Up to 40 per cent of the chemical energy of the burning fuel changed into mechanical energy.
A.
will be
B.
would be
C.
could be
D.
may be
【简答题】By cutting out the middle man and booking your own flights, you can save up to 40 per cent of the cost of a holiday. If you compare this to the price of a hotel stay, the【66】(save) can be even more im...
【单选题】Beijing's top hotels are fielding scores of calls from foreigners and Chinese people eager to book rooms during the 2008 Olympic Games in the Chinese capital. The luxurious and recently-renovated Beij...
A.
The 2008 Olympic Games will be hold there.
B.
More foreigners want to come to China.
C.
People from the United States and Europe are eager to visit China.
D.
Those hotels can offer good service.
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