定量储存单元是内含预先确定的规则数量的商品储存单元，其码制标准是（)。A．通用商品条码B．EAN-13码

A.Compilation fails.

B.The file system has a new empty directory named dir.

C.The file system has a new empty directory named newDir.

D.The file system has a directory named dir, containing a file f1.txt.

E.The file system has a directory named newDir, containing a file f1.txt.

SPATHenvironment variable is set to "." (current directory). Which two java commands entered at the command line will run MainClass？（）

A.java MainClass if run from the /apps directory

B.java com.company.application.MainClass if run from the /apps directory

C.java -classpath /apps com.company.application.MainClass if run from any directory

D.java -classpath . MainClass if run from the /apps/com/company/application directory

E.java -classpath /apps/com/company/application:. MainClass if run from the /apps directory

F.java com.company.application.MainClass if run from the /apps/com/company/application directory

|-- And the following command line invocation: javac -d classes source/Utils.java Assume the current directory is bigProject,what is the result？ （）

A.If the compile is successful, Utils.class is added to the source directory.

B.The compiler returns an invalid flag error.

C.If the compile is successful, Utils.class is added to the classes directory.

D.If the compile is successful, Utils.class is added to the bigProject directory.

在Unix系统中，Shell程序(57)实现显示用户主目录以及当前命令的进程标识符。

A．echo UserHome directory:$LOGNAME echo Current shell's PID:$$

B．echo UserHome directory:$HOME echo Current shell's PID:$@

C．echo UserHome directory:$LOGNAME echo Current shell's PID：$@

D．echo UserHome directory:$HOME echo Current shell's PlD:$$

在UNIX系统中，Shell程序(21)实现显示用户主目录以及当前命令的进程标识符。

A．echo UserHome directory:$LOGNAME echo Current shell's PID:$$

B．echo UserHome directory:$HOME echo Current shell'PID:$@

C．echO UserHOme directOIy:$LOGNAME echo Current shell'sPID:$@

D．echo UserHome directory:$HOME echo Current shell'sPID:$$

ode here}}Assume that the class fileis located in /foo/com/sun/sjcp/，the current directory is/foo/，and that the classpath contains.（current directory）.Which command line correctly runs Commander？（）

A.java Commander

B.java com.sim.sjcp.Commander

C.java com/sun/sjcp/Commander

D.java-cpcom.sun.sjcp Commander

E.java-cpcom/sun/sjcp Commander

The resistances are given, also a current as shown figure, Use Ohm’s law, KVL and KCL to find the voltage source Vx.

I'm pleased with what you've given me and ______ you've done for me.

A．that

B．which

C．all that

D．all what

A．20

B．21

C．19

D．200

A．300

B．299

C．1.003

D．250