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【单选题】
The personnel director at a large company studied the eating habits of the company’s employees. The director noted whether employees brought their own lunches to work, ate at the company cafeteria, or went out to lunch. The goal of the study was to improve the food service at the company cafeteria. This type of data collection would best be considered asA.
an observational study.
B.
a designed experiment.
C.
a random sample.
D.
a quota sample.
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【单选题】某甲亢病人,体温39.5°C,脉搏150次/min,出现恶心、呕吐、大汗淋漓、嗜睡等症状,初步诊断为
A.
抗甲状腺药物中毒
B.
甲状腺功能低下
C.
甲状腺危象
D.
恶性突眼
E.
治疗反应