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港湾酒店如果既有清蒸石斑，又有白灼花螺，则一定会有盐戈曷花蟹；酒店在月末从不卖盐焗花蟹；只有当港湾酒店卖白灼花螺时，老王才会与朋友到港湾酒店吃海鲜。如果上述断定为真，以下哪项一定为真

A. 港湾酒店在月末不会卖清蒸石斑。
B. 老王与朋友到港湾酒店不会既吃清蒸石斑，又吃白灼花螺。
C. 港湾酒店只有在月末才不卖白灼花螺。
D. 老王不会在月末与朋友到港湾酒店吃海鲜，因为那里没有盐焗花蟹。
E. 如果老王在月末与朋友到港湾酒店吃海鲜，他们肯定吃不到清蒸石斑。

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根据对数据源操作方式和结果的不同，查询可以分为五类：选择查询、交叉表查询、参数查询、______和SQL查询。

Invisibility Ring Scientists can’t yet make an invisibility cloak like the one that Harry Potter uses. But, for the first time, they’ve constructed a simple cloaking device that makes itself and something placed inside it invisible to microwaves. When a person "sees" an object, his or her eye senses many different waves of visible light as they bounce off the object. The eye and brain then work together to organize the sesensations and reconstruct the object’s original shape. So, to make an object invisible, scientists have to keep waves from bouncing off it. And they have to make sure the object casts no shadow. Otherwise, the absence of reflected light on one side would give the object away. Invisibility isn’t possible yet with waves of light that the human eye can see. But it is now possible with microwaves. Like visible light, microwaves are a form of radiant energy. They are part of the electromagnetic spectrum, which also includes radio waves, infrared light, ultraviolet rays, X rays, and gamma rays. The wave lengths of microwaves are shorter than those of radio waves but longer than those of visible light. The scientists’ new "invisibility device" is the size of a drink coaster and shaped like a ring. The ring is made of a special material with unusual ability. When microwaves strike the ring, very few bounce off it. Instead, they pass through the ring, which bends the waves all the way around until they reach the opposite side. The waves then return to their original paths. To a detector set up to receive microwaves on the other side of the ring, it looks as if the waves never changed their paths as if there were no object in the way! So, the ring is effectively invisible. When the researchers put a small copper loop inside the ring, it, too, is nearly invisible. However, the cloaking device and anything inside it do cast a pale shadow. And the device works only for microwaves, not for visible light or any kind of electromagnetic radiation. So, Harry Potter’s invisibility cloak doesn’t have any real competition yet. Harry Potter’s invisibility cloak doesn’t have any real competition yet, because ______.

A. scientists have not found out how his cloak works
B. the cloaking device is a total failure
C. the cloaking device works only for microwaves
D. the cloaking device works only for visible light

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有经验的电影剧本作者在创作120页的电影剧本时，通常会交上135页的初稿。正如一位电影剧本作者说的，“这样使那些负责电影的人在接到剧本后有一个机会进行创造，他们至少可以删掉15页”。以上引用的这位电影剧本作者的论述表达了下面哪个观点

A. 除了提供剧本外，通常电影剧本作者并不涉及电影制作的任何方面。
B. 熟练的作者容忍和允许由审核人修改剧本草稿。
C. 真正富有创意的电影剧本作者极易冲动因而不能固守规定的页数。
D. 要想认识到剧本哪部分最适合保留下来，需要特殊的创造力。
E. 即使最有经验的作者也不能写出自始至终质量都是上乘的剧本。

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患者，男，2年来阵发心悸，1d前无明显诱因再次发作，伴头晕、乏力、无胸痛，无黑矇晕厥。查体：BP 96/53mmHg，P 160/min，双肺音清，心律齐，未闻及杂音。对该患者根治方法为

A. 长期口服普罗帕酮维持
B. 长期口服美托洛尔维持
C. 行射频消融术
D. 电转律
E. 无需给予长期维持治疗，发作心律失常时临时给药

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港湾酒店如果既有清蒸石斑，又有白灼花螺，则一定会有盐戈曷花蟹；酒店在月末从不卖盐焗花蟹；只有当港湾酒店卖白灼花螺时，老王才会与朋友到港湾酒店吃海鲜。 如果上述断定为真，以下哪项一定为真

根据对数据源操作方式和结果的不同，查询可以分为五类：选择查询、交叉表查询、参数查询、______和SQL查询。

患者，男，2年来阵发心悸，1d前无明显诱因再次发作，伴头晕、乏力、无胸痛，无黑矇晕厥。查体：BP 96/53mmHg，P 160/min，双肺音清，心律齐，未闻及杂音。 对该患者根治方法为

港湾酒店如果既有清蒸石斑，又有白灼花螺，则一定会有盐戈曷花蟹；酒店在月末从不卖盐焗花蟹；只有当港湾酒店卖白灼花螺时，老王才会与朋友到港湾酒店吃海鲜。如果上述断定为真，以下哪项一定为真

患者，男，2年来阵发心悸，1d前无明显诱因再次发作，伴头晕、乏力、无胸痛，无黑矇晕厥。查体：BP 96/53mmHg，P 160/min，双肺音清，心律齐，未闻及杂音。对该患者根治方法为