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【简答题】
什么是换算截面?在进行截面换算时有哪些基本假定?
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皮皮学刷刷变学霸
举一反三
【单选题】The old man bought a ticket ______.
A.
after he got on the train
B.
before he got on the train
C.
as soon as the conductor told him to buy one
【简答题】光衰减器主要有两种类型:( ),( )。
【简答题】某火电厂有两台机组共同向负荷供电,其耗量特性和约束条件分别为: F 1 =0.02P 1 2 +2P 1 +10t/h , 20MW≤P 1 ≤60MW ; F 2 =0.03P 2 2 +3P 2 +16t/h , 20MW≤P 2 ≤60MW ; 求当有功功率负荷为 80MW 时的经济分配 方案, 并计算最优分配方案比平均分配方案每小时节约多少煤炭 。
【单选题】He soon ______from failure, and promised to work harder than before.
A.
got across
B.
got through
C.
got over
D.
got away
【单选题】They ________ with each other for two years before they got married. [ ]
A.
had fallen in love
B.
got in love
C.
had been in love
D.
fell in love
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