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问题 单项选择题 A1型题

对虾丝状细菌病的症状与病理变化描述不正确的是（）

A.丝状细菌并不侵入宿主组织，也不从宿主体内吸取营养

B.对宿主也可造成较严重的直接危害

C.严重感染鳃部后，可使鳃呈黑色、棕色或绿色

D.患病幼体活力明显下降，严重影响其生长和发育

答案

参考答案：B

单项选择题

女性，7岁，因重型β珠蛋白生成障碍性贫血反复输血治疗出现铁负荷过重，需驱铁治疗。下列哪项指标最能反映驱铁治疗的效果()

A．铁蛋白

B．血清铁

C．转铁蛋白

D．可溶性转铁蛋白受体

E．总铁结合力
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单项选择题 共用题干题

VRML is a（1）for 3D multimedia and shared virtual worlds on the WWW. In comparison to HTML, VRML adds the next level of interaction, structured graphics, and extra（2）（z and time） to the presentation of documents. The applications of VRML are（3）,ranging from simple business graphics to entertaining WWW page graphics, manufacturing, scientific, entertainment, and educational applications, and 3D shared virtual worlds and communities. X3D is the name under which the development of VRML is continued. X3D is based on XML and is backwards（4）with VRML. Furthermore, it is componentized, profiled, and extensible, which makes it possible to use X3D in very different（5），from high-end visualizations to lightweight applications.

空白（3）处应选择（）

A.broad

B.implicit

C.explicit

D.special
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