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【单选题】
有可能引起铸件体积收缩的是（）
A.
铸圈加热过快，造成铸膜腔发生龟裂
B.
由于包埋料的膨胀，不能代偿高熔合金的凝固收缩
C.
铸圈温度太低，没有加热到高熔合金的温度
D.
储金球无法补偿铸件的凝固收缩
E.
包埋蜡型时，包埋料里混有气泡
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】People who do sleep research tell us that a person is a sort of "information processor." We have two ways to use the information we get each day. The first process is used when we are awake. It takes...
A.
people are likely to sleepwalk
B.
people become mentally active
C.
people often wake up
D.
people might do odd things
【单选题】子宫收缩力异常指的是
A.
节律性、极性、强度均不正常
B.
节律性、对称性正常但失去正常强度
C.
对称性、极性正常，节律性异常
D.
节律性正常，对称性和极性异常
E.
节律性、对称性、极性及宫缩的频率和强度均异常