患者男性，30岁，消瘦、乏力、怕热，手颤2个月，着凉后出现高热，恶心，呕吐，躁动，神志恍惚，大汗淋漓。体温39.5℃，心率160／min。

确定诊：断最有意义的检查

A．血常规及血清离子

B．胸片

C．头CT

D．甲状腺吸¹³¹I率

E．血清FT₃、FT₄

Costofqualityis （）.

A.primarily caused by poor workmanship of workers who are building or manufacturing the produce

B.associated with non-conformance to specifications and requirements

C.used to determine whether a quality management program is suitable for a given project

D.negligible for most large projects