单项选择题

用于描述镜片是否容易破裂的参数是 A.
硬度
B.
弹性模量 C.
抗张强度 D.
比重

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1. How did Peking Opera came into being?
A、When four Henan opera troupes performed for the 80th birthday of the Emperor.
B、When four Heibei opera troupes performed for the 80th birthday of the Emperor.
C、When four Anhui opera troupes performed for the 80th birthday of the Emperor.
D、When four Jiangsu opera troupes performed for the 80th birthday of the Emperor.

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绵羊,妊娠138天,离群呆立,视力下降,反应淡漠,2天后出现衰竭、卧地不起;后期发生昏迷,呼出气体有烂苹果味。确诊该病的方法首选() A.
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血液生化检查 C.
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血常规检查 E.
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