某220kV变电所,总占地面积为12000m2(其中接地网的面积为10000m2),220kV为有效接地系统,土壤电阻率为100Ω﹒m,接地短路电流为10kA,接地故障电流持续时间为2s,工程中采用钢接地线作为全所主接地网及电气设备的接地(钢材的热稳定系数取70)。试根据上述条件计算下列各题: 在不考虑腐蚀的情况下,按热稳定计算电气设备的接地线选择下列哪种规格是较合适的?(短路的等效持续时间为1.2s)()
A. 40×4mm2
B. 40×6mm2
C. 50×4mm2
D. 50×6mm2
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If you are staying in the UK for more than 6 months, it may be useful to open a UK bank account. There are a lot of advantages of having a UK current (checking) account:Paying billsMany landlords prefer to collect rent directly from a bank account.You may be able to obtain cheaper services if you pay bills directly from a bank account, e.g. telephone/gas/water/electricity.If you are given a chequebook, you can also write cheques as a safe way of paying for things. CashYou can easily obtain money from cash machines, or pay directly from your account using a debit card (借记卡).Saving moneyIt is generally cheaper to use a UK account than it is to pay by credit card (信用卡) or withdraw (提取) cash from a foreign bank.EmploymentIf you work in the UK, some employers require you to have a bank account so that you can get your pay.Advantages of UK Current AccountPaying bills:(1)to pay rent directly from (46)(2)to obtain (47) services(3)to pay for things with cheques safelyCash: 1) to obtain money from (48) easily2) to pay directly from your accountSaving money: cheaper to use a (49) accountEmployment: to get your (50) through a bank account (50)处填()。
オリンピックが華々しく開幕した。()/奥林匹克运动会辉煌地开幕了。
A. はなばなしく 華々しく(华丽,辉煌)
B. おもおもしく 重々しく(庄重,沉重)
C. ものものしく 物々しく (森严,小题大做)
D. そうぞうしく 騒々しく (吵闹,嘈杂)
The money (borrow)()from the bank has already been paid back.