经常用到的事故统计方法中，（）是直方图与折线图的结合。 A.柱状图 B.控制图 C.

若关于x的一元二次方程kx²-2x+1=0有实数根，则k的取值范围是______．

预防术中知晓的有效措施中不包括（）。

A.麻醉不宜过浅

B.术中应用脑电双频谱分析

C.术中应用脑干听觉诱发电位监测

D.应用强效吸入麻醉药

E.应用氧化亚氮-氧-肌松药麻醉

An unpaid intern at an investment firm has the task of photocopying unannounced investment recommendations after all regular employees have left for the day. With respect to Standard Ⅵ (B), Priority of Transactions, the firm:（）

A. is acting appropriately by having an unpaid intern do the job.

B. is acting appropriately by having the intern perform the task after all employees have left.

C. is probably violating the Standard.

《医务人员艾滋病病毒执业暴露防护工作指导原则（试行）》规定，对均应视为具有传染性的病源物质（）

A、所有病人的血液

B、所有病人的体液

C、被血液、体液污染的物品

D、普通病人吃的食物

水泥，熟石灰等粉尘不宜采用湿式除尘器，主要是因为（）.

A.水泥和熟石灰属于憎水性粉尘

B.润湿性较

C.吸水后易结垢

D.没有润湿