男，40岁，农民，渐起高热已11天，为稽留热，40℃，同时伴有纳呆，脉搏88次／分，

欲提高功率放大器的效率，应使放大器的工作状态为（）.

A.甲类

B.乙类

C.甲乙类

D.丙类

人民警察的职业道德，是指人民警察在依法履行职务活动中所遵循的道德原则和道德规范。政治性、法律性和公正性，是人民警察职业道德三个最显著的特征。 ( )

A small fuel spillage has occurred during helicopter refueling. After the leak has been stopped and fire-control personnel have been notified and are standing by，the next step is to（）.

A.proceed with fueling operation

B.have helicopter move to a safer location

C.wash spilled fuel away with a flood of water

D.clean spilled fuel with rags

从图中红框所示，可以看出这是瑞士的永久居留卡。