小学生应该掌握的与计算有关的知识包括
A.数的认识
B.运算定律
C.运算性质
D.计算法则
E.运算顺序
正确答案是ABCDE
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Complete each of the following sentences with a compound word derived from the one given in brackets.
For reasons of ( )all luggage must be searched. (secure)
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