微启式安全阀的开启高度为阀座喉径的()。
A.1/40—1/20
B.1/4
C.1/10
D.1/20
参考答案:A
在AWT了组件中,为了实现单选按钮的功能,除了用到Checkbox组件以外,还需要用到下列哪个组件
A. Chioce
B. Button
C. JRadioButton
D. CheckboxGroup
— Why don't we choose that road to save time — The bridge to it().
A. has repaired
B. is repaired
C. is being repaired
D. will be repaired