皮皮学，免费搜题
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搜题
【单选题】
正态频率曲线绘在海森频率格纸上为一条（ ）A.
直线
B.
S 型曲线
C.
对称的铃型曲线
D.
不对称的铃型曲线
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】When he realized the true nature of the proposal, he ______ all communication with the group.
A.
converted
B.
reverted
C.
severed
D.
made
【简答题】When he realized the police had spotted him, the man ________ the exit as quickly as possible. A) made off B) made for C) made out D) made up
【判断题】隐形条码能达到既不破坏包装装潢整体效果，也不影响条码特性的目的，同样隐形条码隐形以后，一般制假者难以仿制，其防伪效果很好，并且在印刷时不存在套色问题。()
A.
正确
B.
错误
【单选题】When he realized the true nature of the proposal, he ______ all communication with the group.
A.
convert
B.
reverted
C.
severed
D.
make
【单选题】When he realized the police had spotted him, the man______the exit as quickly as possible.
A.
made for
B.
made out
C.
made up to
D.
made way
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