圆锥的底面半径OA=10cm,母线SA=30cm,一只蚂蚁由A点出发绕侧面一周还回到A点处,已知它的爬行速度为3cm/S,则蚂蚁所用的时间最少是( )。
秒
that it has been No.1 hit on the pop charts over the past month·
A.Simon’s newly released album is very well—received
B.SO well received Simon’s newly released album is
C.Well.received is Simon’s newly released album
D.So well received is Simon’s newly released album
CENTUM CS3000系统中,()用于FCS同现场检测仪表、执行机构进行数字通信的现场通信网络,并可将数字信号转变成4~20mA的模拟信号。
A.以太网
B.V-net
C.FIELBUS
D.EXOPC