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【单选题】
有关呕血与黑便的描述,不正确的一项是A.
呕血呈咖啡色是血液在胃内经胃酸作用形成亚铁血红素所致
B.
黑便呈柏油样是由于血红蛋白中铁与肠内硫化物作用形成硫化铁所致
C.
有黑便不一定有呕血
D.
有呕血常伴黑便
E.
幽门以上出血表现为呕血,幽门以下出血表现为黑便
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皮皮学刷刷变学霸
举一反三
【简答题】A．wanted B．hoped C．expected D．desired
【单选题】The difference between measured and desired values is called
A.
make-up
B.
desired value
C.
deviation
D.
set value
【简答题】The objective in inventory strategy is to achieve desired customer service with the maximum inventory commitment．（ ）
【判断题】The objective in inventory strategy is to achieve desired customer service with the minimum inventory commitment. （ ）
A.
正确
B.
错误
【单选题】When we have difficulty ______ desired objects or reaching desired goals we experience negative emotions such as grief and anger.
A.
at obtaining
B.
in obtaining
C.
on obtaining
D.
with obtaining
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