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【多选题】
From where can we get the information of the company with whom we want to establish business relations with?A.
trade directory
B.
market survey
C.
Chambers of Commerce in foreign countries
D.
trade fairs and exhibitions held at home and abroad
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举一反三
【简答题】Good evening, ladies and gentlemen! First of all, I’d like to 20 a sincere welcome to you all, the new comers of our company. As you know, our company is one of the top 50 companies in the country and...
【简答题】在纯电阻、纯电感和纯电容交流电路中，电压与电流的相位关系如何？
【简答题】在纯电容交流电路中,电压和电流和相位关系为 ( ) ;在纯电感交流电路中,电压和电流和相位关系为 ( ) 。
【多选题】曾经铝被认为是极其稀有的贵重金属,价格远远高于黄金,原因是:
A.
电解法提炼，需要消耗大量的电能
B.
铝元素在地球上的含量太少
C.
人们太喜欢铝制品了
D.
氧化铝的熔点非常高
【简答题】Section D Good evening, ladies and gentlemen! First of all, I'd like to 20 ___ a sincere welcome to you all, the new comers of our company. As you know, our company is one of the top 50 companies in t...
【简答题】Good evening, ladies and gentlemen! First of all, I would like to ______(20) a sincere welcome to you all, the new comers of our company. As you know, our company is one of the top 50 companies in the...
【多选题】曾经铝被认为是极其稀有的贵重金属，价格远远高于黄金，原因是
A.
氧化铝的熔点非常高
B.
电解法提炼，需要消耗大量的电能
C.
铝元素在地球上的含量太少
D.
人们太喜欢铝制品了
【多选题】在纯电容电路中电流、电压的关系是
A.
频率不相同
B.
相位相差 90° （u 落后 i 90° ）
C.
电压和电流最大值、有效值与电阻XC之间的关系都符合欧姆定律。
D.
相位相差 90° （u 超前 i 90° ）
【简答题】Good evening, ladies andgentlemen! First of all, I’d like to 20 a sincere welcome to you all, the new comersof our company. As you know, our company is one of the top 50 companies in thecountry and ha...
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