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【多选题】
Experiments have proved that children can be instructed in swimming __1__.At a special swimming pool in Los Angeles, children become expert at ­­­­__2___underwater even before they can walk. Babies of two months old do not appear to__3__enter the water, It is not long before they ___4__swimming that they can pickup weights from the floor of the pool. A game that__5__ these young swimmers isthe underwater tricycle race. Tricycles are lined up on the floor of the poolseven feet under water. The children___6__ each other to reach the other end ofthe pool. Many pedal their tricycles, but most of them __7__push or drag them.Some children can cover the whole length of the pool without ___8_even once.Whether they will ever become future Olympic champions, only time will tell.___9__,they should encourage those among us who cannot swim five yards before they are__10__. A Meanwhile
B.
coming up for breath
C.
gasping for air
D.
holding their breath
E.
at a very early age
F.
is very popular with
G.
prefer to
H.
are so accustomed to
I.
be reluctant to
J.
compete against
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【单选题】各种公路用土中最好的材料是
A.
黏土
B.
冻土
C.
粉土
D.
砂土
【判断题】方向公差无基准( )
A.
正确
B.
错误
【判断题】网络外部性与市场需求无关( )
A.
正确
B.
错误
【判断题】建筑物按建筑的使用功能分为 工业建筑 、 农业建筑 和民用建筑,民用建筑又可分为 居住建筑 和 公共建筑 ;按建筑的规模和数量可分为 大量性建筑 和 大型性建筑 。
A.
正确
B.
错误
【单选题】一般紫外分光光度法所用光源为( ),而可见分光光度法光源为( )
A.
钨灯—氘灯
B.
氘灯—钨灯
C.
钠光灯—氘灯
D.
能斯特灯—钨灯
【多选题】按建筑的规模和数量可分为 和 。( )
A.
大量性建筑
B.
标志性建筑
C.
大型性建筑
D.
小规模建筑
【简答题】按建筑的规模和数量可分为()和大型性建筑。
【简答题】按建筑的规模和数量可分为 建筑 和 建筑 。
【单选题】以下不属于标准走姿的是哪一项呢?
A.
头正、肩平
B.
面带微笑
C.
瞻前顾后
D.
双目平视
【判断题】网络外部性与市场需求无关( )
A.
正确
B.
错误