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【单选题】
男,1岁,腹痛、腹泻、血性便、无发热,急性肾衰竭。可能的病原体是A.
ETEC(肠产毒型大肠杆菌)
B.
EPEC(肠致病型大肠杆菌)
C.
EIEC(肠侵袭型大肠杆菌)
D.
EHEC(肠出血型大肠杆菌)
E.
EAEC(肠聚集型大肠杆菌)
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【单选题】What’s mean of “Approach” signal aspects ?
A.
tell the train to proceed
B.
tell engineers to move at restricted speed.
C.
tell engineers stop immediately .
D.
tell engineers to reduce its speed to 35miles per hour and prepare to stop at the next signal.
【单选题】What’s mean of “restricting” signal aspects ?
A.
indicates that the train may proceed at restricted speed.
B.
indicates that the train may proceed.
C.
indicates that the train stop immediately .
D.
indicates that the train should reduce its speed to 35miles per hour and prepare to stop at the next signal.
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