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【简答题】
地面水环境影响预测中,小河一般可简化为( )。
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【判断题】投影运算之后不仅取消了原关系中的某些列,而且可能会取消某些元组。
A.
正确
B.
错误
【单选题】Taiwan lies _____ the east of Fujian. [     ]
A.
in
B.
on
C.
to
D.
at
【简答题】截面为矩形的非合金钢,除轧制外未经进一步加工,钢材的宽度为100mm,厚度为5mm,冷成形笔直状报验
【单选题】使用力的平行四边形法则、三角形法则、多边形法则的前提条件是( )
A.
所有力交于一点
B.
所有力大小相同
C.
所有力平行
D.
以上都不对
【单选题】In previous times, when fresh meat was inadequate, pigeons were kept by many households as a source of food.
A.
in short store
B.
in short provision
C.
in short reserve
D.
in short supply.
【单选题】She ( ) go to college.No one can stop her.
A.
thinks
B.
wants
C.
is determined to
D.
likes
【单选题】Taiwan lies ______ the southern coast of China, and it’s really _____ island. Is that so
A.
in, a
B.
in, an
C.
on ,an
D.
off ,an
【单选题】由于岩石的抗压强度远大于它的抗拉强度,所以岩石属于( )
A.
坚硬材料
B.
脆性材料
C.
延性材料
D.
脆性材料,但围压较大时,会呈现延性特征
【简答题】Taiwan lies ______the southeast of China. A. in             B. on            C. to
【单选题】Taiwan lies ______ the east of Fujian , ______ the southeast of China .
A.
on; in
B.
to; in
C.
on; to
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