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【判断题】
负载 则此 三相负载对称。A.
正确
B.
错误
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反馈参考答案：
举一反三
【判断题】练习单板滑雪中级技术时建议选择中级滑雪场地,要求平均坡度在 10°-18°之间,最大坡度不超过22°,滑行雪道宽度不少于35米,长度不低于200米。
A.
正确
B.
错误
【单选题】Lifetime Employment in Japanese Companies In most large Japanese companies, there is a policy of lifetime employment. What this means is that when people leave school or university to join an enterpri...
A.
leaves his company only when business is bad.
B.
gets a job soon after he leaves school or university.
C.
can work there throughout his career.
D.
can have his serious mistakes in work corrected.
【简答题】A．Because British companies are more ambitious than US companies. B．Because British companies place more importance on PR than US companies. C．Because British companies are heavily involved in plannin...
【单选题】单相半波可控整流输出电压平均值 U d ≈ ( ) 。
A.
． 0.45U 2 (1+cos α)/2
B.
． 0.9U 2 (1+cos α)/2
C.
C．0.45U 2
D.
． 0.9U 2
【简答题】交流电源电压为 U 2 的单相半波可控整流电路,整流输出电压为 U d 。 控制角α=0°时,整流输出电压平均值为最( ), 用 U d0 表示, U d0 =( ) 。
【判断题】Gift giving is often discouraged or limited by many US companies and therefore most employees are unable to accept them.()
A.
正确
B.
错误
【单选题】单相半波电阻负载可控整流电路,直流输出电压平均值 U d 是( )。
A.
（ A）0.45U 2
B.
（ B）0.45U 2 cosα
C.
（ C）0.9U 2 cosα
D.
（ D）0.9U 2
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