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【单选题】
某外科手术后病人,HR145次/分,BP78/46mmHg,CVP4cmH2O,尿量25ml/h, 根据上述情况考虑为A.
容量不足
B.
左心衰
C.
血管扩张
D.
容量负荷过多
E.
心功能不全
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举一反三
【单选题】If two pair-elements of a kinematic pair have surface contact or its equivalent, the kinematic pair is known as a ( ).
A.
higher pair
B.
gear pair
C.
lower pair
D.
cam pair
【单选题】If two pair-elements of a kinematic pair have surface contact or its equivalent, the kinematic pair is known as a ( ).
A.
higher pair
B.
lower pair
C.
gear pair
D.
cam pair
【单选题】The writer mentions______as a pair to indicate that people should have moderate feelings of guilt.
A.
eccentric people and fashionable people
B.
overanxious people and less sociable people
C.
sociable people and healthy people
D.
reserved people and radical people
【单选题】欲配制pH=6.50的缓冲溶液,用下列何种酸最好
A.
(CH3)2AsO2H)(Ka=6.40×10-7)
B.
CICH2COOH (Ka=1.40X10-3)
C.
CH3COOH(Ka=1.76×10-5)
D.
HCOOH(Ka=1.77×10-4)
【单选题】汽化器式燃油系统中 , 喷油嘴出口与浮子式内燃油液面高度的关系为
A.
喷油嘴出口等于浮子室内燃油液面高度
B.
喷油嘴出口低于浮子室内燃油液面高度
C.
喷油嘴出口高于浮子室内燃油液面高度
D.
两者的高度关系不定
【单选题】欲配制pH=6.50的缓冲溶液,下列酸最好的是:( )
A.
(CH 3 ) 2 AsO 2 H (K a =6.40×10 -7 )
B.
ClCH 2 COOH (K a =1.40×10 -3 )
C.
CH 3 COOH (K a =1.76×10 -5 )
D.
HCOOH (K a =1.77×10 -4 )
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