建立和实施职业安全健康管理体系有助于大型生产经营单位的职业安全健康管理功能()。A．

既能活血，又能止血的药物是（）。

A.蒲黄

B.五灵脂

C.血竭

D.水蛭

E.茜草

—Were you late ________  the meeting?

—No, I arrived there ten minutes________ the meeting started.

A．for ; before

B．at ; before

C．for ; till

D．at ; after

WLANs are increasingly popular because they enable cost-effective connections among people，applications and data that were not possible，or not cost-effective, in the past. For example, WLAN-based applications can enable fine-grained management of supply and distribution （66） to improve their efficienty and reduce （67） . WLANs can also enable entirely new business processes．To cite but one example, hospitals are using WLAN-enabled point-of-care applications to reduce errors and improve overall （68）care．WLAN management solutions provide a variety of other benefits that can be substantial but difficult to measure. For example, they can protect corporate data by preventing（69）through rogue access points. They help control salary costs, by allowing IT staffs to manage larger networks without adding staff. And they can improve overall network mananement by integrating with customers’ existing systems, such as OpenView and UniCenter. Fortunately, it isn’t necessary to measure these benefits to justify investing in WLAN management solutions，which can quickly pav for themselves simolv by minimizinu time-consunlina（70）and administrative chores.

A．chores

B．chains

C．changes

D．links

在两船间转载原油操作时，必须使用软管。

管线吹扫的前提条件是（）。

A、被吹扫管线内已无杂物

B、被吹扫管线已与设备断开

C、被吹扫管线已用水冲洗

D、被吹扫管线法兰已全部拆开