脉动真空压力蒸汽灭菌器的装载量不得小于柜室容积的( )
A．5%B．10%C．15%D．20%E．25%
参考答案：A
急性苯中毒主要损害的是（）。
A.骨骼系统
B.血液系统
C.神经系统
D.消化系统
E.呼吸系统
Password is a secret series of (73) that enables a user to access a file，computer,orprogram．On multi—user systems，each user must enter his or her password before the computerwill respond to (74) ．The password helps ensure that (75) users do not access the computer．In addition，data files and programs may require a password．
A．symbol B．sign C．characters D．characteristic
