問答題

Science can now account for many things which were thought to be ________ by ancient people. (mystery)

答案： mysteries完整句子：Science can now account for many things which ...

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利用普通車床可以加工端面、圓柱面、圓錐面、切槽、加工螺紋等。（）

答案：正確

單項選擇題

有以下程序：#includeint main（）{ int a=233,b=17; printf（“%d”,a+b）; return 0;}程序運行后的輸出結(jié)果是（）

A.233
B．17
C．250
D．260

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