皮皮学，免费搜题
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【单选题】
体积最大的白细胞是:
A.
中性粒细胞
B.
嗜碱性粒细胞
C.
嗜酸性粒细胞
D.
单核细胞
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【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
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【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.
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【单选题】单相半波可控硅整流电路，当控制角α=0时，其直流输出电压平均值U do 为（）倍整流变压器副边电压。
A.
0.45
B.
1.0
C.
D.
0.9
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【判断题】单相半波可控整流电阻性负载电路中,输出直流电压平均值 U d 为0。45 。
A.
正确
B.
错误
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【简答题】He is a director of the most companies at the same time.
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【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...
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【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
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【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 =( ) 。
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【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
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【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
查看完整题目与答案
相关题目：
【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
查看完整题目与答案
【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.
查看完整题目与答案
【单选题】单相半波可控硅整流电路，当控制角α=0时，其直流输出电压平均值U do 为（）倍整流变压器副边电压。
A.
0.45
B.
1.0
C.
D.
0.9
查看完整题目与答案
【判断题】单相半波可控整流电阻性负载电路中,输出直流电压平均值 U d 为0。45 。
A.
正确
B.
错误
查看完整题目与答案
【简答题】He is a director of the most companies at the same time.
查看完整题目与答案
【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...
查看完整题目与答案
【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
查看完整题目与答案
【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 =( ) 。
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案