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【单选题】
人类历史上最早的一种计算工具是A.
算盘
B.
齿轮式加，减计算器
C.
差分机和分析机
D.
机电式计算机
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反馈参考答案：
举一反三
【单选题】If we cannot educate people for life as well as for a career, then that is a _________ against our educational system.
A.
poll
B.
salary
C.
render
D.
conviction
【单选题】There was a time when parents who wanted an educational present for their children would buy a typewriter, a globe or an encyclopedia set. Now those【C1】______ seem hopelessly old-fashioned; this Chris...
A.
items
B.
toys
C.
sets
D.
series
【单选题】There was a time when parents who wanted an educational present for their children would buy a typewriter, a globe or an encyclopedia set. Now those 【21】______ seem hopelessly old-fashioned: this Chri...
A.
items
B.
toys
C.
sets
D.
series
【单选题】有一国家控制点的坐标:x=3102467.280m ,y=19367622.380m,该点距中央子午线的距离是( )。
A.
3102467.280m
B.
367622．380m
C.
19367622．380m
D.
132377.620m
【单选题】有一国家控制点的坐标为:x=310246.280m ,y=19 367622.380m,则该点位于6 ̊ 带的第( )带。
A.
17
B.
18
C.
19
D.
31
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