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【单选题】
病人,女性,35岁,患风湿性心脏瓣膜病十多年,目前稍一劳累即感心慌气短,夜间常常不能平卧,检查有颈静脉怒张,心率98次/分,律绝对不齐,心尖部舒隆隆样杂音,双下肢凹陷性水肿。该病人的瓣膜损害性质很可能是A.
二尖瓣狭窄
B.
二尖瓣关闭不全
C.
主动脉瓣狭窄
D.
主动脉瓣关闭不全
E.
联合瓣膜病变
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皮皮学刷刷变学霸
举一反三
【单选题】The reaction of Portland cement with water is ( ).
A.
exothermic
B.
endothermic
C.
thermic
D.
dothermic
【单选题】( )is produced by mixing a small amount of an air-en-training agent with ordinary Portland cement.
A.
Low heat cement
B.
Portland pozzolana
C.
Air-en-training cement
D.
High strength cement
【单选题】3单选Portland cement is termed a hydraulic cement because its hardness develops by chemical reaction with.
A.
Clay
B.
Lime
C.
Gypsum
D.
Water
【单选题】Portland cement is termed a hydraulic cement because its hardness develops by chemical reaction with .
A.
Clay
B.
Lime
C.
Gypsum
D.
Water
【简答题】portland cement
【简答题】7 Portland cement
【简答题】The mass percent of tricalcium silicate ( ) is 50% in Portland cement, which acts as the binding agent in concrete. Calculate the mass percent of calcium in this Portland cement.
【单选题】患者,男性,岁。因胸痛就诊,既往有心绞痛十年。鉴别急性心肌梗死与心绞痛,症状的主要区别是
A.
疼痛持续时间不同
B.
疼痛表现不同
C.
疼痛部位不同
D.
疼痛性质不同
E.
引起诱因不同
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