下列关于家兔抓取和固定的叙述，哪项正确？（）
A. 提抓家兔腰部
B. 抓兔耳提取家兔
C. 台式固定常用于兔血压测定
D. 盒式固定常用于颈、胸部手术
E. 拖拉家兔四肢
患者，男，45岁。因突然呕血入院。10年前患乙肝，因肝功能损害曾多次住院治疗。近感腹胀，乏力。查体：脾大，腹水。应首先考虑的是（）
A. 肺结核慢性空洞咯血
B. 胃溃疡出血
C. 急性支气管炎出血
D. 肝硬化，胃底食管静脉丛破裂出血
E. 十二指肠溃疡出血
The Company network utilizes the Multiple-instance Spanning Tree protocol in its switched LAN. Which three statements about the MST protocol （IEEE 802.1S） are true？ （）
A. To verify the MST configuration， the show pending command can be used in MST configuration mode.
B. When RSTP and MSTP are configured； UplinkFast and BackboneFast must also be enabled.
C. All switches in the same MST region must have the same VLAN-to-instance mapping， but different configuration revision numbers.
D. All switches in an MST region， except distribution layer switches， should have their priority lowered from the default value 32768.
E. An MST region is a group of MST switches that appear as a single virtual bridge to adjacent CST and MST regions.
F. Enabling MST with the "spanning-tree modemst" global configuration command also enables RST
引起LDH升高的原因不包括（）。
A. 心肌梗死
B. 肌肉损伤
C. 肝炎
D. 溶血
E. 肾脏损伤
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