Customers often act on impulse.
A. immediately
B. promptly
C. without planning in advance
D. after careful consideration
查看答案
The salesperson who is selling to a customer with a strong conviction toward the product must have extensive product knowledge.
A. doubt
B. belief
C. feeling
D. suspicion
电压的实际方向为电位降的方向。
A. 对
B. 错
如果有I=-2A，则说明实际方向与参考方向相反。
A. 对
B. 错
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