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【单选题】
关于杆活塞式液压缸说法正确的是( )。A.
活塞杆面积越小，活塞往复运动的速度差别越小、
B.
活塞杆面积越大，活塞往复运动的速度差别越小、
C.
活塞往复运动速度差别和活塞杆面积无关、
D.
不确定、
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举一反三
【单选题】Which environment variable must be changed in auser’s profile so that upon login，the command prompt identifies the server？（）
A.
PMT
B.
PS1
C.
PRT
D.
PT1
【单选题】If average fixed costs equal $60 and average total costs equal $120 when output is 100, the total variable cost must be
A.
40
B.
60
C.
6000
D.
8000
【单选题】电路如图所示,稳压管的稳压值分别为 V Z1 =8V , V Z2 =6V ,两稳压管的最小稳定电流均为 I Zmin =5mA ,若 V I =10V 时,电路的输出电压 U O 等于( ) V 。
A.
6
B.
8
C.
10
D.
5
【单选题】You need to retrieve the username cookie from an HTTP request. If this cookie does NOT exist, then the c variable will be null. Which code snippet must be used to retrieve this cookie object?
A.
Cookie c = request.getCookie("username");
B.
Cookie c = null; for ( Iterator i = request.getCookies(); i.hasNext(); ) { Cookie o = (Cookie) i.next(); if ( o.getName().equals("username") ) { c = o; break; } }
C.
Cookie c = null; for ( Enumeration e = request.getCookies(); e.hasMoreElements(); ) { Cookie o = (Cookie) e.nextElement(); if ( o.getName().equals("username") ) { c = o; break; } }
D.
Cookie c = null; Cookie[] cookies = request.getCookies(); for ( int i = 0; i < cookies.length; i++ ) { if ( cookies[i].getName().equals("username") ) { c=cookies[i]; break; } }
【单选题】Rose, who grows geraniums to sell, is currently producing a level of output at which her marginal cost equals her average variable cost. What must be true about Rose's average total cost at this level...
A.
It is at a minimum.
B.
It is at a maximum.
C.
It is falling with increased output.
D.
It is equal to average variable cost.
【简答题】 p____ a. 最重要的 n. 负责人,校长
【单选题】A class design requires that a particular member variable must be accesible for direct access by any subclasses of this class, otherwise not by classes which are not members of the same package. What ...
A.
The variable should be marked public
B.
The variable should be marked private
C.
The variable should be marked protected
D.
The variable should have no special access modifier
【单选题】A variable must be defined ________.
A.
in every program
B.
and initialized at the same time
C.
once it has been used
D.
before it can be used
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