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【单选题】
哪些不是高频开关电源的优点？A.
体积小
B.
重量轻
C.
功率因数高
D.
无须考虑电磁兼容性
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反馈参考答案：
举一反三
【单选题】当压缩比和加热量一定时,内燃机三种加热理想循环的热效率从大到小排列依次为:
A.
定容、混合、定压
B.
定容、定压、混合
C.
定压、混合、定容
D.
定压、定容、混合
【简答题】联合国维和民事警察的领导体系分哪几个级别?
【单选题】If you have not signed a contract, you are under no______to pay them any money.
A.
responsibility
B.
liability
C.
circumstance
D.
obligation
【判断题】The phrase “observing the contract once you have signed it” is to remind the buyers of reading the contract carefully when they are signing it.
A.
正确
B.
错误
【简答题】交换机的互连方式可分为 和 。
【判断题】The phrase “observing the contract once you have signed it” is to remind the buyers of reading the contract carefully when they are signing it.
A.
正确
B.
错误
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