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My husband, Tom, has always been good with animals, but I was still amazed when he befriended a female grouse ( 松鸡 ). It's 1 for a grouse to have any contact ( 接触 ) with people. In fact, they're hard to spot, 2 they usually fly off when they hear humans approaching. This grouse came into our lives in 3 . Tom was working out in the field when he 4 her walking around at the edge of the field. She was 5 unafraid and seemed to be 6 about what he was doing. Tom saw the 7 bird several times, and she got more comfortable around him. We quickly grew 8 of the bird and decided to call her Mildred. One day, as Tom was working, Mildred came within a few feet of him to watch. Tom 9 he didn't see her and kept working to see what she would do next. Apparently, she didn't like to be 10 . She'd run up and peck ( 啄 ) at Tom's hands, then 11 off to see what he would do. This went on for about 20 minutes, until Mildred became tired of the 12 and left. As spring went and summer came, Mildred started to 13 more and more often. 14 Mildred felt comfortable enough to jump up on Tom's leg and stay long enough for me to get a 15 of the two of them together. This friendly grouse soon felt 16 not just with our family, but with anybody who walked or drove by. When hunting season opened, we put a 17 at the end of our driveway asking 18 not to shoot our pet grouse. My father, who lived down the road, 19 warned people not to shoot her. 20 , hunters would stop and take pictures, because they had never seen anything like her.
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【单选题】预防医学的研究内容不包括
A.
卫生学
B.
临床医学
C.
环境医学
D.
社会医学社区医学
E.
流行病学医学统计学
【单选题】预防医学的研究内容不包括
A.
研究环境因素对人群健康的影响规律
B.
分析人群疾病分布趋势
C.
分析健康水平动态变化趋势
D.
探讨治疗疾病的方法
E.
制订预防疾病与促进健康的策
【单选题】关于 SQL 视图更新的可执行性,下列说法不正确的是 _________ 。
A.
如果视图是由单个表的列构成,但并没有包括主键,则不能更新
B.
如果视图中包括了 group by 子句,则不能更新
C.
对于由单一 Table 子集构成的视图,即如果视图是从单个基本表使用选择、投影操作导出的,并且包含了基本表的主键,则不能更新
D.
如果视图的 select 目标列包含聚集函数,则不能更新
【多选题】发酵有不同的类型,谷氨酸发酵属于( )。
A.
液体发酵
B.
固体发酵
C.
需氧发酵
D.
厌氧发酵
【单选题】关于 SQL 视图更新的可执行性,下列说法不正确的是 _________ 。
A.
如果视图的 select 目标列包含聚集函数,则不能更新
B.
如果视图中包括了 group by 子句,则不能更新
C.
如果视图是由单个表的列构成,但并没有包括主键,则不能更新
D.
对于由单一 Table 子集构成的视图,即如果视图是从单个基本表使用选择、投影操作导出的,并且包含了基本表的主键,则不能更新
【单选题】关于SQL视图更新的可执行性,下列说法不正确的是_________。
A.
对于由单一Table子集构成的视图,即如果视图是从单个基本表使用选择、投影操作导出的,并且包含了基本表的主键,则不能更新
B.
如果视图的select目标列包含聚集函数,则不能更新
C.
如果视图中包括了group by子句,则不能更新
D.
如果视图是由单个表的列构成,但并没有包括主键,则不能更新
【单选题】一个命题含有n个原子命题,则对其所有可能赋值有 种 .
A.
n
B.
2n
C.
n^2
D.
2^n
【单选题】关于 SQL 视图更新的可执行性,下列说法不正确的是 _________ 。
A.
如果视图是由单个表的列构成,但并没有包括主键,则不能更新
B.
对于由单一 Table 子集构成的视图,即如果视图是从单个基本表使用选择、投影操作导出的,并且包含了基本表的主键,则不能更新
C.
如果视图的 select 目标列包含聚集函数,则不能更新
D.
如果视图中包括了 group by 子句,则不能更新
【单选题】关于SQL视图更新的可执行性,下列说法不正确的是( )。
A.
如果视图的select目标列包含聚集函数,则不能更新
B.
如果视图是由单个表的列构成,但并没有包括主键,则不能更新
C.
如果视图中包括了group by子句,则不能更新
D.
对于由单一Table子集构成的视图,即如果视图是从单个基本表使用选择、投影操作导出的,并且包含了基本表的主键,则不能更新
【单选题】一个字符的白欧洲ASCII码的长度是
A.
6 bits
B.
16 bits
C.
8 bits
D.
7 bits
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