焊接接头的弯曲试验是用以检验接头的抗拉强度及显示缺陷。()
A. 对
B. 错
下列有关基于Swing的Applet用户界面说法不正确的是
A. 在需要自定义Swing构件的时候,首先要确定使用哪种构件类作为所定制构件的父类
B. paintComponent( )方法位于JComponent类内,该方法与paint( )方法类似,也要求一个Graphics类的实例为参数
C. 无论在系统开始执行还是窗口被覆盖后需要重新绘制时,paintComponent( )方法都会被系统自动调用,所以在程序中不要调用它,否则会与自动化过程相冲突
D. 如果需要重新绘制Applet,就调用方法paintComponent( )
下列焊条牌号中,( )是型号为EZNi-1的铸铁焊条。
A. Z208
B. Z308
C. Z408
D. Z508
Half of the graduates can't make up their minds partly because ______.
A. they find job security a big problem
B. they don't want to make their decisions alone
C. their parents' opinions have some influence on them
D. most of them like to work in state enterprises