测量直流电压时,万用表的红表笔接(),黑表笔接(),万用表上“DC”表示(),“AC”表示()。
参考答案:正极;负极;直流;交流
During the required periodic abandon ship drill aboard a ship,each person not assigned duties in the muster list is().
A.instructed in the use of portable fire extinguishers
B.shown a video demonstrating lifeboat launching
C.instructed in the use of life jackets
D.not required to attend the boat drill
能治愈恶性疟的药物是
A.伯氯喹
B.乙胺嘧啶
C.氨苯砜
D.氯喹
E.磺胺多辛(周效磺胺)