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【单选题】
一个负载 R L 经理想变压器接到信号源上,已知信号源的内阻 R 0 = 800 W ,变压器的变比 K =10 。若该负载折算到的阻值 R ¢ L 正好与 R 0 达到阻抗匹配,则可知负载 R L 为 ( ) 。A.
0.8Ω
B.
8Ω
C.
80Ω
D.
800Ω
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【单选题】3岁入院,择期手术,不让父母离开,见到医护人员和陌生人躲避,主要原因是:
A.
对黑暗恐惧
B.
分离性焦虑
C.
对死亡恐惧
D.
对手术焦虑
E.
对医源性限制的焦虑
【单选题】“ C ool ” is a word with many meanings . I ts old meaning is used to express a temperature that is a little bit cold . A s the world has changed , the world has had many different meanings . “ C ool ”...
A.
can be used instead of many words
B.
usually means something interesting
C.
can make your life colorful
D.
may not be as cool as it seems.
【单选题】“ C ool ” is a word with many meanings . I ts old meaning is used to express a temperature that is a little bit cold . A s the world has changed , the world has had many different meanings . “ C ool ”...
A.
interested in
B.
angry about
C.
afraid of
D.
unhappy with
【简答题】完形填空。 Many people have to work 1 . Some people do not mind. Other people think it's terrible. One man thinks that working at the weekends can be 2 . He is George Smith. Mr Smith works in an office, in...
【单选题】患儿,女,3岁。患法洛四联症,择期手术。患儿入院5天来,不让父母离开身边,见到医护人员及陌生人员靠近会躲避,睡眠中常有惊醒,患儿出现上述表现的主要原因是
A.
对黑暗恐惧
B.
分离型焦虑
C.
对死亡恐惧
D.
对手术焦虑
E.
对医源性限制的焦虑
【单选题】患儿,女,3岁。患法洛四联症,择期手术。患儿入院5天来,不让父母离开身边,见到医护人员及陌生人员靠近会躲避,睡眠中常有惊醒。患儿出现上述表现的主要原因是
A.
黑暗恐惧
B.
分离性焦虑
C.
死亡恐惧
D.
手术焦虑
E.
医源性限制的焦虑
【单选题】企业资源有限、实力较弱,难以开拓整个市场。适宜采用的目标市场策略是()
A.
无差异性市场营销策略
B.
差异性目标市场营销策略
C.
集中性目标市场营销策略
D.
分散性目标市场营销策略
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