患儿女，1岁。生后未接种卡介苗，体弱。近1个月持续咳嗽伴体温38℃左右，最高达39℃，心肺听诊无异常，肝肋下2cm，脾肋下1cm，颈淋巴结无明显肿大。为明确诊断，最有价值的辅助检查是（）

A.血常规、血培养

B.病毒IgM、IgG抗体和结核菌抗体IgM、IgG

C.血沉

D.胸部X线片或胸部CT

E.结核菌素皮试

When receiving a distress alert, the SAR authorities ashore and the ships in the vicinity of the ship in distress will（）soonest.

A.reach the distress area

B.conduct a sector search

C.send rescue vessels

D.assist coordinately in SAR operation