医务人员使用的针头、备皮刀等医用锐器,使用后应当()。
A、直接放入利器盒
B、扔入垃圾袋
C、放入消毒液中浸泡
D、收集后卖掉
参考答案:A
简述定量库存控制法及其优缺点。
---I’ve heard some scientists have sent a spacecraft to Mars.
---Really? Has it arrived _____?
A already B yet C still D ever