单项选择题

下列不是铸造应力的防治和消除措施的是()

A.采取同时凝固
B.降低铸型温度
C.进行去应力退火
D.改善铸型和型芯的退让性
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单项选择题
The book offers some advice about how to make a good ________ on job interviews.
A.attitude
B.appearance
C.effect
D.impression
单项选择题
收集血液标本的操作哪项不正确()
A.做动脉血气分析的血标本立即注入试管迅速送检
B.测定血清钾.钠.氯的血标本不可摇动
C.做红细胞计数的血标本注入加抗凝剂的容器内摇匀
D.取血后应取下针头,将血液沿试管壁缓慢注入
E.勿将泡沫注入试管内
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