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【判断题】
在一定气流速度条件下,管道的直径越小,其摩擦阻力就越大。( )A.
正确
B.
错误
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举一反三
【判断题】We put the index finger and mid-finger apart with palm against the receiver to mean “OK”, which was first used by Winston Churchill.
A.
正确
B.
错误
【判断题】We put index finger and mid-finger apart with palm against the receiver to mean “OK”, which was first used by Winston Churchill.
A.
正确
B.
错误
【单选题】Which of the following is true of an index used to support a UNIQUE constraint?（）
A.
It must have the UNIQUE attribute.
B.
It cannot be created explicitly by the user.
C.
It must have the UNIQUE and CLUSTER attributes.
D.
It must have the UNIQUE WHERE NOT NULL attribute.
【判断题】We put the index finger and mid-finger apart with palm against the receiver to mean “OK,” which was first used by Winston Churchill.
A.
正确
B.
错误
【简答题】育成鸡采取限量法饲养时,限制饲喂量为正常采食量的( ),适用于蛋用型育成鸡。
【单选题】4层建筑，单层层高为4．2m，建筑有中庭64m×18m×16m，则机械排烟风机的排烟量为________。
A.
69120
B.
73728
C.
102000
D.
112200
【判断题】We put the index finger and mid-finger apart with palm against the recerver to mean "OK," which was first used by Winston Churchill.
A.
正确
B.
错误
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