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【单选题】
直流双闭环调速系统中出现电源电压波动和负载转矩波动时,
A.
ACR 抑制电网电压波动，ASR抑制转矩波动
B.
ACR 抑制转矩波动，ASR抑制电压波动
C.
ACR 放大转矩波动，ASR抑制电压波动
D.
ACR 放大电网电压波动，ASR抑制转矩波动
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举一反三
【单选题】According to the passage, Japanese firms differ strikingly from American firms in that the former ______.
A.
use subcontractors more extensively
B.
are less flexible in terms of lifetime employment
C.
hold on to the values of society
D.
are more efficient in competition than the latter
查看完整题目与答案
【单选题】青霉素发酵液预处理的添加剂是
A.
助溶剂
B.
絮凝剂
C.
交联剂
D.
萃取剂
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【单选题】Seeking a competitive advantage, some professional service firms(for example, firms providing advertising, accounting, or health care services) have considered offering unconditional guarantees of sat...
A.
account for the popularity of a practice
B.
evaluate the utility of a practice
C.
demonstrate how to institute a practice
D.
weigh the ethics of using a strategy
E.
explain the reasons for pursuing a strategy
查看完整题目与答案
【单选题】提出智力多元理论的心理学家是()
A.
加德纳
B.
斯滕伯格
C.
瑟斯顿
D.
吉尔福特
查看完整题目与答案
【单选题】图 1(a) 所示, M 是一个小型理想变压器,原副线圈匝数之比 n1:n2=10:1 ,接线柱 a 、 b 接上一个正弦交变电源,电压随时间变化规律如图 1(b) 所示。变压器右侧部分为一火警报警系统原理图,其中 R2 为用半导体热敏材料 ( 电阻随温度升高而减小 ) 制成的传感器, R1 为一定值电阻。下列说法中正确的是 ( ) 。
A.
电压表 V 示数为 22V
B.
当传感器 R2 所在处出现火警时，电压表 V 的示数减小
C.
当传感器 R2 所在处出现火警时，电流表 A 的示数减小
D.
当传感器 R2 所在处出现火警时，电阻 R1 的功率变小
查看完整题目与答案
【判断题】支部大会讨论接收预备党员，无记名投票时，因故不能到会的有表决权的正式党员，可以不统计在票数内。()
A.
正确
B.
错误
查看完整题目与答案
【判断题】Although firms marketing abroad face many of the same challenges as firms marketing domestically, international environments present added uncertainties which must be accurately interpreted.()
A.
正确
B.
错误
查看完整题目与答案
【单选题】如图甲所示，M是一个小型理想变压器，原副线圈匝数之比n 1 ：n 2 =10：1，接线柱a，b接上一个正弦交变电源，电压随时间变化规律如图乙所示变压器右侧部分为一火警报警系统原理图，其中R 2 为用半导体热敏材料（电阻随温度升高而减小）制成的传感器，R 1 为一定值电阻。下列说法中正确的是（）
A.
电压表V示数为22V
B.
当传感器R 2 所在处出现火警时，电压表V的示数减小
C.
当传感器R 2 所在处出现火警时，电流表A的示数减小
D.
当传感器R 2 所在处出现火警时，电阻R 1 的功率变小
查看完整题目与答案
【单选题】Firms in a competitive market are incurring economic losses. In the long run, firms exit the market and as they do, the economic losses of the remaining firms ______.
A.
increase because the market demand for the good decreases
B.
decrease until the remaining firms break even
C.
decrease until the remaining firms make economic profits
D.
do not change
E.
increase because the market demand for the good does not change
查看完整题目与答案
【单选题】______more effectively with foreign firms, many Chinese firms have turned to new technology．
A.
Being competed
B.
To compete
C.
Competing
D.
Competed
查看完整题目与答案
相关题目：
【单选题】According to the passage, Japanese firms differ strikingly from American firms in that the former ______.
A.
use subcontractors more extensively
B.
are less flexible in terms of lifetime employment
C.
hold on to the values of society
D.
are more efficient in competition than the latter
查看完整题目与答案
【单选题】青霉素发酵液预处理的添加剂是
A.
助溶剂
B.
絮凝剂
C.
交联剂
D.
萃取剂
查看完整题目与答案
【单选题】Seeking a competitive advantage, some professional service firms(for example, firms providing advertising, accounting, or health care services) have considered offering unconditional guarantees of sat...
A.
account for the popularity of a practice
B.
evaluate the utility of a practice
C.
demonstrate how to institute a practice
D.
weigh the ethics of using a strategy
E.
explain the reasons for pursuing a strategy
查看完整题目与答案
【单选题】提出智力多元理论的心理学家是()
A.
加德纳
B.
斯滕伯格
C.
瑟斯顿
D.
吉尔福特
查看完整题目与答案
【单选题】图 1(a) 所示, M 是一个小型理想变压器,原副线圈匝数之比 n1:n2=10:1 ,接线柱 a 、 b 接上一个正弦交变电源,电压随时间变化规律如图 1(b) 所示。变压器右侧部分为一火警报警系统原理图,其中 R2 为用半导体热敏材料 ( 电阻随温度升高而减小 ) 制成的传感器, R1 为一定值电阻。下列说法中正确的是 ( ) 。
A.
电压表 V 示数为 22V
B.
当传感器 R2 所在处出现火警时，电压表 V 的示数减小
C.
当传感器 R2 所在处出现火警时，电流表 A 的示数减小
D.
当传感器 R2 所在处出现火警时，电阻 R1 的功率变小
查看完整题目与答案
【判断题】支部大会讨论接收预备党员，无记名投票时，因故不能到会的有表决权的正式党员，可以不统计在票数内。()
A.
正确
B.
错误
查看完整题目与答案
【判断题】Although firms marketing abroad face many of the same challenges as firms marketing domestically, international environments present added uncertainties which must be accurately interpreted.()
A.
正确
B.
错误
查看完整题目与答案
【单选题】如图甲所示，M是一个小型理想变压器，原副线圈匝数之比n 1 ：n 2 =10：1，接线柱a，b接上一个正弦交变电源，电压随时间变化规律如图乙所示变压器右侧部分为一火警报警系统原理图，其中R 2 为用半导体热敏材料（电阻随温度升高而减小）制成的传感器，R 1 为一定值电阻。下列说法中正确的是（）
A.
电压表V示数为22V
B.
当传感器R 2 所在处出现火警时，电压表V的示数减小
C.
当传感器R 2 所在处出现火警时，电流表A的示数减小
D.
当传感器R 2 所在处出现火警时，电阻R 1 的功率变小
查看完整题目与答案
【单选题】Firms in a competitive market are incurring economic losses. In the long run, firms exit the market and as they do, the economic losses of the remaining firms ______.
A.
increase because the market demand for the good decreases
B.
decrease until the remaining firms break even
C.
decrease until the remaining firms make economic profits
D.
do not change
E.
increase because the market demand for the good does not change
查看完整题目与答案
【单选题】______more effectively with foreign firms, many Chinese firms have turned to new technology．
A.
Being competed
B.
To compete
C.
Competing
D.
Competed
查看完整题目与答案