传输机架接电源线一般为4组或（）组，其中主备电源应该在（）的电源头柜。
A.2
B.3
C.相同
D.不同
参考答案：A, D
He had ________me not to play games on the Internet again, but hardly could he get rid of them.
A．wished
B．promised
C．advised
D．persuaded
针对易感人群的措施是
A．隔离、留验、医学观察、应急接种等B．预防接种、药物预防、个人防护C．疾病监测D．三级预防E．消毒杀虫
