皮皮学，免费搜题
登录
搜题
【判断题】
一阶RC动态电路，电源是周期为T的方波电压，要实现积分运算，时间常数远远大于T。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Ancient cave art and more recent paintings and sculpture illustrate only people's fear about bears.
A.
Y
B.
N
C.
NG
【单选题】Who said 'The only thing we have to fear is fear itself'?
A.
Abraham Lincoln.
B.
Winston Churchill.
C.
John F. Kennedy.
D.
Franklin D.Roosevelt.
【简答题】Franklin Roosevelt told the Americans that the only thing we have to fear is ________.
【单选题】The most destructive element in the human mind is fear．Only when we are no longer afraid _______ to live．
A.
we are beginning
B.
begin we
C.
we begin
D.
do we begin
【简答题】The child seemed to have a(n) ______ (normal)fear of strangers.
【单选题】'The only thing we have to fear is fear itself' meant that ______.
A.
Americans would lose if they gave way to fear
B.
Americans have no real troubles during the 1930s
C.
F. D. R. would solve America's problems because he was not afraid
D.
Americans were in trouble because they hadn't looked at their troubles with clear heads
【单选题】Fear becomes a problem only when ______ .
A.
the danger is thought greater than it really is
B.
eth danger is ore psychological than physical
C.
one cannot stand the danger
D.
one is not well prepared for it
相关题目：