如图所示,请分别在圆圈中填上合适电表符号,并标出正负接线柱,完成电路图.
由图可知甲表跟右边的灯泡并联,所以应为电压表;乙表跟串联在干路上,所以应为电流表.
答案如下图:
第一心音形成的主要机制是()
A. * * 肌的收缩
B.房室瓣开放
C.二尖瓣和三尖瓣关闭
D.心室壁的震动
E.半月瓣关闭
Being assigned as the project manager to a project you perform earned value Analysis and find the following results:EV=250000;PV=200000;AC=275000;BAC=500000.What is right ?()
A.EAC=400000
B.EAC=550000
C.BTC=400000
D.ETC=75000