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【单选题】
特殊标志位 可产生占空比为50%,周期为1s的脉冲串,称为秒脉冲。A.
SM0.0
B.
SM0.4
C.
SM0.1
D.
SM0.5
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反馈参考答案：
举一反三
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【单选题】Few places are so awash in information technology as the U. S. college campuses. And thanks to the explosive growth of the Internet, universities have intensified their efforts to wire the ivory tower...
A.
investigate the invisible cyberspace
B.
excel in the computer operational skills
C.
subscribe to an on-line information service
D.
share their thought and ideas generously
【单选题】下列输入框(id=etPwd)文本变化事件监听,正确的是
A.
etPwd.addTextChangedListener( { @Override public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { } @Override public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) } @Override public void afterTextChanged(Editable arg0) { } });
B.
etPwd.addTextChangedListener(new TextWatcher() { @Override public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { } @Override public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) } @Override public void afterTextChanged(Editable arg0) { } });
C.
etPwd.addFocusables(views, direction);
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