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【单选题】
NIST计算机安全手册定义计算机安全的目标是保持信息系统资源的（）。A.
机密性
B.
完整性
C.
可用性
D.
以上3是
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【单选题】设向量 a , b , c 为三个任意向量，则（ a + b )× c = ( )
A.
a × c + c × b
B.
a × c + b × c
C.
c × a + c × b
D.
c × a + b × c
【简答题】由空间向量基本定理可知，空间任意向量 p 可由三个不共面的向量 a ， b ， c 唯一确定地表示为 p =x a +y b +z c ，则称（x，y，z）为基底 ＜ a ， b ， c ＞ 下的广义坐标．特别地，当 ＜ a ， b ， c ＞ 为单位正交基底时，（x，y，z）为直角坐标．设 i ， j ， k 分别为直角坐标中x，y，z正方向上的单位向量，则空间直角坐标（1，2，3）在基底 ＜ ...
【单选题】Natural flavorings and fragrances are often costly and limited in supply. For example, the vital ingredient in a rose fragrance is extracted from natural rose oil at a cost of thousands of dollars a p...
A.
natural flavorings and fragrances are not quite dear
B.
the limitation of natural flavorings and fragrances is clear
C.
the supply of natural flavorings and fragrances is adequate to meet the demand
D.
the cost of producing natural flavorings and fragrances is high
【单选题】无民事行为能力人是指
A.
不满十周岁的未成年人和不能辨认自己行为的精神病人
B.
不满十四周岁的未成年人和精神病人
C.
不能完全辨认自己行为的精神病人
D.
不满十周岁的未成年人和所有精神病人
【单选题】Natural flavorings and fragrances are often costly and limited in supply. For example, the vital ingredient in a rose fragrance is extracted from natural rose oil at a cost of thousands of dollars a p...
A.
natural flavorings and fragrances are not quite dear
B.
the limitation of natural flavorings and fragrances is clear
C.
the supply of natural flavorings and fragrances is adequate to meet the demand
D.
the cost of producing natural flavorings and fragrances is high
【简答题】Questions 16 to 20 are based on the following passage. The destruction of our natural resources and contamination of our food supply continue occur, largely because of the extreme difficulty in affixi...
【判断题】This was the last place the explorers would leave, for it lay riches and natural resources. 这是那些探险家最后离开的地方，因为那里蕴藏着财富和自然资源。()
A.
正确
B.
错误
【简答题】The Natural Approach suggests that grammar use should be limited to situations where it will not ______with communication.
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