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【多选题】
使酶失活的因素有 :A.
强酸或强碱
B.
低温
C.
煮沸
D.
震荡
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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】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
【多选题】Portland cement is made by heating a mixture of ( ) and ( ), or other similar bulk composition.
A.
alite
B.
limestone
C.
clay
D.
belite
【简答题】( ) hardens
slowly and takes long time to add to the strength in Portland cementA. C3S B. C2S C. C3A D. C4AF
【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.
【简答题】等价类划分有两种不同的情况: 和 。
【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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