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【单选题】
C Too much TV-watching can harm children’s ability to learn and even reduce their chances of getting a college degree,new studies suggest in the latest effort to examine the effects of television on children. One of the studies looked at nearly 400northern California third-graders.Those with TVs in their bedrooms scored about eight points lower on math and language arts tests than children without bedroom TVs. A second study ,looking at nearly 1000 grown-ups in New Zealand,found lower education levels among 26-year –olds who had watched lots of TV during childhood .But the results don’t prove that TV is the cause and don't ride out that alxeady poorly motivated youngstersC年轻人)may wash lots of TV. Their study measured the TV habits of 26-year-olds between ages5 and 15. These with college degrees had watched拍average of tess than two hours ofTV per weekninght during childhood, compared with an averageofme than 2 1/2 hours fcf those wbe had no education beyond high school In the California study, children with TVs in their rooms but no computer at home scored the lowest while those with no bedroom TV but who had home computers scored the highesl While this study does not prove that bedroom TV sets caused the lower scores , it adds to accumulating fimiings that children shonldn't have TVs in their bedrooms According to the Califomia study, the inw-scoring group might
A.
have watched a lot of TV
B.
not be interested ted in math
C.
be unable to go to college
D.
have had computers in their bedrooms
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【单选题】提高钢筋混凝土受弯构件截面刚度最有效的措施是( )。
A.
提高混凝土强度等级
B.
增加钢筋的面积
C.
改变截面形状
D.
增加截面高度
【简答题】子宫收缩乏力的常见原因有哪些?
【单选题】关于反应: 4Al+3TiO 2 +3C=2Al 2 O 3 +3TiC的叙述中正确的是
A.
Al是还原剂,TiC是氧化产物
B.
TiO 2 是氧化剂,TiC是还原产物
C.
反应中氧化剂与还原剂的物质的量之比是1:1
D.
生成1molTiC转移4mol电子
【简答题】蓄电池充电终了的特征之一是电解液密度和 上升至最大值,且2-3小时不再上升。
【判断题】在比浊法测定枯草芽孢杆菌含量时,以水作为空白对照
A.
正确
B.
错误
【多选题】Excel 2010中,下列说法错误的有( )。
A.
求和操作只能对同列的数据进行
B.
求和操作只能对同行的数据进行
C.
求和时要多选中一个空白格,以便保存结果
D.
求和操作对同行同列的数据都能进行
【单选题】TIC表示( )。
A.
压力指示报警
B.
温度指示报警
C.
压力指示控制
D.
温度指示控制
【简答题】抄绘下面的图形。
【简答题】与直齿轮比较,斜齿轮传动有哪些优点和缺点?
【判断题】杜尔阁认为借贷是一种商业交易。他说: “ 有息借贷并不是别的,只是一种商业交易,在这种交易中,贷款人是出卖货币使用权的人,借款人则是买进这种使用权的人 ” 。
A.
正确
B.
错误
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