严格说,输入信号很小时,达不到三极管的开启电压,三极管不导电。因此在正、负半周交替过零处会出现一些非线性失真,这个失真称为交越失真。
查看答案
When does a complaint usually happen?
A. . at the beginning of the travel
B. during the travel
C. after the travel
D. All of them
off-site complaints refer to complaints that tourists may make
A. face to face
B. in the tourist attractions
C. through phone calls or e-mails
D. to directors
On-site complaints means _______.
A. 到点投诉
B. 现场投诉
C. 非现场投诉
D. . 景点投诉
Which is not the reason for tourists to make complaints?（）
A. Complaints caused by tourists’ phycological state
B. Complaints caused by tourism quality
Complaints caused by improper service
D. . Complaints caused by external factors during the trip
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