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【单选题】
增加血管通透性的体液因子是A.
心肌抑制因子
B.
组胺
C.
儿茶酚胺
D.
.血栓素A2
E.
前列环素
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【简答题】D Health officials in the United States reported last week on what they believe could be a medical first. Officials said doctors performed what could be the first double lung transplant on a person wh...
【单选题】The crosshead and crankpin bearings are secured to the_____ by means of fitted bolt.
A.
crosshead guides
B.
piston rod
C.
crosshead shoes
D.
connecting rod
【单选题】The position of ______ on the crosshead is determined by dowel pins.
A.
grooves
B.
piston skirts
C.
position rings
D.
crosshead shoes
【单选题】The immediate cause of the crash of Colgan Air Flight 3407is __________.
A.
the captain was chitchatting with the first officer
B.
thc young first officer had little experience dealing with icyconditions
C.
both the captain and the first officer were quite tired after along-time journey
D.
the captain Marvin Renslows mistaken operation
【单选题】In a large slow-speed propulsion diesel engine, the force applied to the crosshead is ______.
A.
against the crosshead during power stroke and away from the crosshead during the compression stroke
B.
against the crosshead during the compression stroke and away from the crosshead during the compression stroke
C.
against the crosshead during the power and compression strokes
D.
away from the crosshead during the power and compression strokes
【单选题】The position of______on the crosshead is determined by dowel pins.
A.
the grooves
B.
the piston rings
C.
the piston skirts
D.
the crosshead shoes
【简答题】阅读理解: Health officials in the United States reported last week on what they believe could be a medical first. Officials said doctors performed what could be the first double lung transplant on a perso...
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