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单选题Two boards are being cut for a construction project. If the total length of the boards is 100 inches and the shorter board is 5 inches less than half the length of the longer board, what is the length of the shorter board?A 25 inchesB 30 inchesC 35 inc

题目
单选题
Two boards are being cut for a construction project. If the total length of the boards is 100 inches and the shorter board is 5 inches less than half the length of the longer board, what is the length of the shorter board?
A

25 inches

B

30 inches

C

35 inches

D

65 inches

E

70 inches

参考答案和解析
正确答案： B
解析：
设长板的长度为x，短板的长度为y，故x+y=100，y=0.5x-5，故y=30，所以本题选B项。
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第1题：

int型public成员变量MAX LENGTH，该值保持为常数100，则定义这个变量的语句是( )。

A．publicintMAX_LENGTH=100

B．finalintMAX LENGTH=100

C．publicconstintMAX_LENGTH=100

D．publicfinalintMAX_LENGTH=100


正确答案：D
解析： 本题考查Java中变量的声明。选项A虽然按照题目要求定义了—个变量，但没有满足保持为常数的要求，该变量可以被改变。选项B没有满足题日要求的public成员变量；选项C与C语言混淆，const是C语言用来定义常值变量的关键字，Java中定义常值变量使用的是final属性，说明该值赋值以后永不改变，所以选项D为正确答案。

第2题：

The length of the steering oar in a lifeboat is ______．

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B.the same length as the rowing oars

C.longer than the rowing oars

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正确答案：C

第3题：

How long is the longest cross－sea bridge?()

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第4题：

The （） will have a rotating honorary chairman.

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正确答案:A

第5题：

All passengers should present their _____ documents at the check-in counter.

A. boarded
B. boarding
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答案：B
解析：

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The number and position of hydrants arranged on board shall be such that _______，one of which shall be from a single length of hose，may reach any part of the ship normally accessible to the passengers or crew while the ship is being navigated．

A.at least two jets of water which shall be from the same length of hose

B.at least two jets of water emanating from the same hydrant

C.at least two jets of water not emanating from the same hydrant

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正确答案：D

第7题：

How is the size of chain determined?______.

A.Length of link in inches

B.Diameter of metal in link in inches or centimeters

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第8题：

ApublicmembervairablecalledMAX_LENGTHwhichisinttype,thevalueofthevariableremainsconstantvalue100.Useashortstatementtodefinethevariable.()

A.publicintMAX_LENGTH=100；

B.finalintMAX_LENGTH=100；

C.finalpublicintMAX_LENGTH=100；

D.publicfinalintMAX_LENGTH=100；


参考答案：D
Java中共有变量使用public定义，常量变量使用final，另外注意的是修饰符的顺序，一个最完整的修饰是publicstaticfinalintvarial_a=100;这个顺序不能错，这和c++中也是不同的。而答案c恰恰错在修饰符的顺序上。

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第10题：

Definition of Length：（）

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正确答案:C,D

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