用户电缆线路环路电阻一般不大于1800Ω(包括话机电阻),特别情况下允许到(),馈电电流应不小于18mA。
参考答案:3000Ω
属于颞下颌关节功能区的是()
A.关节结节后斜面与髁突前斜面
B.关节窝顶与髁突前斜面
C.关节结节后斜面与髁突横嵴
D.关节窝顶与髁突后斜面
E.关节结节前斜面与髁突后斜面
Mr Brown didn’t come to the Guangzhou Asian Games being held _____ his poor health.
A.in terms of
B.on account of
C.by means of
D.instead of