CENTUM CS系统总貌窗口中显示稳定灰色的含义是()。
A.通信误差
B.通信显示块
C.新产生的报警正在等待确认
D.报警状态已被确认
参考答案:A
Bricks covered the ground like red autumn leaves. No wind, _____, could blow them away. [ ]
A. but
B. besides
C. however
D. except
肾动脉狭窄由大动脉炎引起者,肾外表现可见()
A.冠心病
B.脑卒中
C.主动脉粥样硬化
D.无脉症
E.外周动脉硬化