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心主言

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You have a trunk link operating between two switches and you’re experiencing problems withframes leaking between the two VLANs. Each switch has identical modules， software revisionsand VLAN configuration information. Spanning tree protocol is disabled on all VLANs. What isprobably causing this problem？（）

A. The link is using IEEE 802.1Q protocol
B. The link is using IEEE 802.1E protocol
C. Spanning tree is disabled
D. Not enough information to determine
E. The native VLAN information is identical at each end of the link
F. The native VLAN information is different at each end of the link

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可溶性还原染料显色一般采用（）法。

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泵注起泡剂时应先启泵排空，再关排空阀，逐步加大排量，待压力（）井口压力时打开注人阀注入起泡剂。

A. 低于
B. 略高于
C. 等于
D. 接近

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不属于氯丙嗪禁忌证的是：

A. 冠心病
B. 昏迷
C. 青光眼
D. 癫痫
E. 溃疡病

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