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【单选题】
倒顺开关在使用时,必须将接地线接到倒顺开关的( )A.
接地螺钉上
B.
罩壳上
C.
手柄上
D.
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举一反三
【单选题】Which of the following descriptions about the opening chapter in the novel is incorrect?
A.
The truth of selection process is concealed by a competition for twosomes.
B.
It is implied in this chapter that Noah has an appetite for animal flesh.
C.
There was never a “natural selection” among the animals.
D.
According to the narrator, though God is benevolent, the person that he chooses to preserve is not a nice man at all.
【简答题】根据2.52÷21=0.12，直接填空． 25.2÷21= 0.0252÷21= ______÷21=12．
【简答题】3 4 =______÷______= ( ) 12 = 21 ( ) ．
【简答题】先计算一下12×42和24×21的积，看看它们相等不相等，原来12×42可以改写成12×2×21=24×21，所以12×42=24×21，这样的算式还有12×63=36×21等，你能再写一个吗？
【简答题】3÷4= () 12 =______%=21：______=______（小数）．
【简答题】75=______：12=12()=21÷______=______%0.75=______：12= 12 () =21÷______=______%
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