In 1983, when oil process were till
high in my area, I installed a ground-source heat pump in my brand-new, and
insulated 1,600-square-foot house. It cost several thousand dollars more than
comparable systems that use oil, gas, or wood, but I figured I’d recover my
higher initial expense in a few years through lower energy bills. True, my heat pump runs on electricity-an expensive commodity where I live. But most of its energy comes from the earth: a propylene-glycol solution circulates through 1,200 feet of two-inch-diameter plastic pipe buried three feet deep in a field next to my house. As it travels, the solution absorbs heat from the surrounding soil, even when soil temperature drops below freezing. My ground-source heat pump also offers important benefits that have nothing to do with econom A. uses no electricity B. has a fire-safety shutoff C. does not pollute the air in the house D. pollutes the air in house [填空题]在STM-N的段开销中,仅保留(),A1为11110110(F6H)、A2为00101000(28H)。
[单项选择]企业价值的最终决定因素是未来的现金流量,而未来的现金流量又取决于增长率。在企业价值评估的各种模型中,居于核心地位的增长率指标是( )。
A. 现金流量增长率 B. 资产增长率 C. 利润增长率 D. 收入增长率 [多选题]以下哪些工具是防静电工具:( )。
A.防静电腕带 B.金属镊子 C.三芯插头电烙铁 D.金属芯片起拔器 [多选题]《中国铁路上海局集团有限公司铁路旅客电子客票实施细则(暂行)》(上铁客〔2020〕180号 )规定,旅客使用电子支付方式通过()购买的铁路电子客票,均可通过12306.cn网站或车站指定窗口办理改签、退票手续。
A.车站售票窗口 B.自动售票机 C.铁路代售点 D.12306.cn网站 [多选题]若在有分布式电源接入的低压配电网上停电工作,至少应采取以下措施之一防止反送电( )。
A.接地 B.绝缘遮蔽 C.在断开点加锁 D.悬挂标示牌和装设遮栏(围栏) [单选题](6156)SRM80清筛车当液压系统发生故障不能工作时,应重新装载达到装载标准且应使用手压泵。操作控 制阀使张紧的( )处于“放松”位。
A.上升导槽 B.下降导槽 C.挖掘链 D.回转输送带 [判断题]队(站)务会,每半个月至少召开 1 次,由中队(站)首长主持,副班长以上人员参加,通常包括分析完成任务、开展训练、 政治教育、行政管理和思想政治工作等方面的情况,进行总结、 讲评,布置工作
A.正确 B.错误 我来回答: 提交
|