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【单选题】
如图1-2所示的线性有源二端网络,接上1Ω负载时的输出功率与接上4Ω负载时相同, 那么该网络的戴维宁等效电路中的参数R0为( )A.
2
B.
2.5
C.
3
D.
4
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反馈参考答案：
举一反三
【简答题】当波长为 300 nm ( 1 nm=10 - 9 m )的光照射在某金属表面时,产生的光电子动能范围为 0 ~ 4.0 × 10 - 19 J 。此金属的遏止电压为| U a | = V ; 阈值 频率 ν 0 = Hz 。
【单选题】听力原文：M: You didn't say anything at yesterday's meeting. Don't you think it was a success? W: I was really fascinated by what every speaker said. Q: Why didn't the woman say anything at the meeting? (1...
A.
She didn't think it a success.
B.
She was listening too attentively to the speakers.
C.
She was puzzled by what the speakers said.
D.
She had nothing to say.
【单选题】听力原文：W: You didn't say anything at yesterday's meeting. Don't you think it was a success? M: I was really fascinated by what every speaker said. Q: Why didn't the man say anything at the meeting? (16)
A.
He didn't think it a success.
B.
He was listening too attentively to the speakers.
C.
He was puzzled by what the speakers said.
D.
He had nothing to say.
【简答题】心肌梗死A.梗死灶呈节段性 B.梗死易液化 C.梗死灶呈锥形 D.梗死灶呈不规则形 E.梗死灶为对称性 肠梗死A.梗死灶呈节段性 B.梗死易液化 C.梗死灶呈锥形 D.梗死灶呈不规则形 E.梗死灶为对称性 脾梗死A.梗死灶呈节段性 B.梗死易液化 C.梗死灶呈锥形 D.梗死灶呈不规则形 E.梗死灶为对称性
【单选题】— Sorry to have hurt you. — _______. You didn't mean to , did you? [ ]
A.
Don't say so
B.
Take it easy
C.
OK
D.
Forget it
【简答题】肠梗死A.梗死灶呈节段性 B.梗死易液化 C.梗死灶呈锥形 D.梗死灶呈不规则形 E.梗死灶为对称性 脾梗死A.梗死灶呈节段性 B.梗死易液化 C.梗死灶呈锥形 D.梗死灶呈不规则形 E.梗死灶为对称性 心肌梗死A.梗死灶呈节段性 B.梗死易液化 C.梗死灶呈锥形 D.梗死灶呈不规则形 E.梗死灶为对称性
【单选题】下列哪一个选项表述了满足完全竞争要求所必需的条件?
A.
市场价格对需求或供给的短期变化没有反应。
B.
价格等于平均成本，但不等于边际成本。
C.
因为地理位置的不同而支付不同的工资率，虽然这些工作的要求是完全一样的。
D.
产品差异使价格等于平均成本，但不等于可得到的最小平均成本。
E.
边际成本等于平均成本。
【简答题】为什么一些细菌完成分裂的时间比细菌基因组的复制所需的时间要少?为什么在选择营养条件下，E.coli中可以存在多叉的染色体或多达4个以上的开环染色体拷贝，而正常情况下染色体是单拷贝的?
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