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问题 选择题

下列叙述中，不正确的一项是 [ ]

A．沙尘暴发生时，水平能见度都小于几十米

B．森林植被的大量砍伐是我国沙尘暴频繁发生的重要原因之一

C．在我国，沙尘暴主要是由于冷空气南下，大风卷起尘沙所致

D．沙尘暴的天气表现为空气浑浊、天气昏暗，大风中夹带着大量的尘沙和干土

答案

答案：A

单项选择题 A2型题

消化道造影所示食管中、下段的黏膜皱襞明显增宽、迂曲，呈蚯蚓状或串珠状充盈缺损，管壁边缘呈锯齿状。应考虑的疾病是（）

A.食管癌

B.食管静脉曲张

C.反流性食管炎

D.正常食管影像

E.食管异物
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单项选择题

Most computer systems are (16) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (17) to an outsider attack by preventing.
(18) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (19) users. Detecting such abusive usage as well as attacks by outsides not only provides information on damage assessment, but also helps to prevent future attacks. These attacks are usually (20) by tools referred to as Intrusion Detection Systems.

A．vulnerable

B．week

C．sensitively

D．helpless
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