裸露病毒的化学组成是
A．核酸、蛋白质B．核酸、蛋白质、糖脂C．核酸D．糖蛋白E．感染性蛋白
参考答案：A
His ________behavior made everyone nervous. He was always rushing to open doors and perform other small tasks, apologizing unnecessarily for any inconvenience that he might have caused.
A．oblivious
B．observant
C．obsequious
D．obsolescent
用钢流真空处理不脱氧钢液时可生成（）。
A.液滴状组织
B.泡沫状组织
C.星云状组织
D.球状组织
