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【简答题】
已知 一个6缸发动机，其参数如下： 曲柄半径R=30mm 汽缸直径D=80mm 燃烧室容积Vc=0.036L 求：该发动机的气缸工作容积，气缸总容积，压缩比，及其排量为多少
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【简答题】若式子 有意义，则 的取值范围为 .
【单选题】What is the least amount of money for the tickets that machines sell?
A.
One dollar.
B.
40 dollars.
C.
4.95 dollars.
D.
20 dollars.
【单选题】As a salesperson, your commission is directly propor-tional to the dollar amount of sales you make. If yoursales are $800, your commission is $112. How muchcommission would you earn if you had $1,400 ...
A.
$210
B.
$196
C.
$175
D.
$128
E.
$64
【判断题】In a double-entry accounting system, the total dollar amount debited must always equal the total dollar amount credited.
A.
正确
B.
错误
【判断题】In a double-entry accounting system, the total dollar amount debited must always equal the total dollar amount credited.
A.
正确
B.
错误
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