工作时间不得擅自离开工作岗位，不从事与工作无关的闲杂活动，不妨碍他人工作。若需要暂离工作岗位，应请示当班主管，经获准后方可离开岗位。
参考答案：对
不能通过输血传播的病原是（）
A.单纯疱疹病毒
B.EB病毒
C.巨细胞病毒
D.肝炎病毒
E.HIV
A new technique（）,the producity of loading as a whole increased by 20 percent.
A.working out
B.having been worked out
C.having worked out
D.to have been worked out
