预测我国人口总数到哪一年,将接近24亿人() A.2001 B.2030 C.301 发布时间:2018-01-17 01:19 │ 来源:www.tikuol.com 题型:单项选择题 问题: 预测我国人口总数到哪一年,将接近24亿人()A.2001B.2030C.3010D.无法确定
题型:单项选择题 The white building across the street, _____ roof has been seriously damaged in the hurricane, belongs to a hospital.A.whereB.whyC.whichD.whose 查看答案
题型:单项选择题 电路如试题3-19图所示,已知变压器副边电压有效值U2=20V,输出电压可调范围为10~15.V,Io=1A。求调整管T1的最大允许耗散功率PCM至少应为()。A.9WB.18WC.14WD.3W 查看答案