• 2022-06-15
    某溶液中含有[tex=2.071x1.214]f67h7/Nq7kLZq4HBmj+LUA==[/tex]和[tex=2.214x1.214]IbJKycgatgcGKUcJtdW6Ag==[/tex],二者的浓度均为[tex=5.786x1.214]y+Ne3N0IuKqikruT0gIy/IOJPVk3pEkYjr2j1GMRgyg=[/tex]。在室温下通入[tex=1.857x1.214]oN1dOv8MNVPZD+bmMhnJng==[/tex]使其成为饱和溶液[tex=10.429x1.571]K6E0mWAwSd2O9YtazQ9eWaffE9nX/82XjUrSJlMZWa2xValgeaPG6TsLrbmi+j3vhKny11dl4dGTgiRW6UddFA==[/tex],并加[tex=1.857x1.0]kEAnyff8WmkU+yRQV3B0pg==[/tex]控制[tex=1.643x1.214]61sSWAo54SK6MT1z+AtUeg==[/tex]浓度。为了使[tex=1.714x1.0]Wyw0o+C1pAmf+iEAczdAtA==[/tex]沉淀出来而[tex=2.214x1.214]IbJKycgatgcGKUcJtdW6Ag==[/tex]仍留在溶液中,则溶液中的[tex=1.5x1.143]QG5C1TJy1x6rscFKe4vbvg==[/tex]浓度最低应为多少?此时溶液中的[tex=2.071x1.214]f67h7/Nq7kLZq4HBmj+LUA==[/tex]是否沉淀完全?(已知:[tex=39.714x1.643]NzM6AwILUinp1GJlP+NG6KI4yvLRErwEGFLABsFunEUGsumTfWfSshQNoC0443fZat3wB/uJuSDpPxLLymw6P/ndbhycVoiphJK3e4WQntF1S98YEWcUQsF+hd/SRFkVMzr6bqrmooZUcuTzz0sOlDxv/W69WtrogplxL8HBTO1y0LQ2ojU9scqL4snYu8WDr7TkZZL6/y+Xbw9ILmKvkxNB+Q5YQFcDjy0hCV6f70+hURl0TTLvLVTUY7biIJi81RsQMmTQ866WRLrr6nb61vJsgo5oPnAO7qkV0extuzI=[/tex]。)
  • [tex=8.357x1.5]Wgh6YTI9DRxsvgqSJktr6dWQVbEYd7SrdeJSCf3Qt6WWi8SweXwyhusjKHVMbGVy[/tex]要使[tex=1.714x1.0]Wyw0o+C1pAmf+iEAczdAtA==[/tex]沉淀:[tex=13.929x1.643]0gbrh5nIgEBFM7C2LRViarmm0xofZrvZ6pbmkppr29t0pB0leafY/6rGPcw2T7QFlsLSugFRI4YuMqtwu63sFBBbR8QuZhBO+nsW2m9fQOjctu974nhRs+KZQlZ3fPuk[/tex][tex=13.214x5.071]a0s3MH7cLIdmiBRR0YN06zbALlssGMZCt9nrRGfnmYOD57wDDgB8w78eUs6wRdtwVH4qNsjBXMnWvKIGWTbXIfwcglEaMPniNpWIoCLzW4HyoxmaMhJICuyu0+BnVr46uvwMRZDNGTWaWRg7zfEkCfSNM/iqjyDcb3oiyEGQ9z2vnhHLzeCncqQvGeB5PJ/Fg+WO9ZyiWDMGryo+AiFkvBYupcoKYd4V8DHfzbiKhTIGiAh0HPSjjMFHEjSp+f5DiUxIIdBXyM4ndlYgoBy49VrE4WoZf59N6+T4OXa5gpmFzwXddhZzKB/H17qQDu3b[/tex]要使[tex=2.214x1.214]IbJKycgatgcGKUcJtdW6Ag==[/tex]仍留在溶液中:[tex=14.357x1.643]HjGrQGhHDqE+UpQVDrVKELSsc9o/iaCowKrH+NvmbkNw7pZ1LuYxwzEZSjWxs7tSDEqZzlYM1CfU46ufT9mVJAjv4ZS+z5XCkBUu1lDPwBa0tutL1rhF2yd5Ao8AqOFq[/tex][tex=21.286x12.5]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[/tex]即应加入[tex=1.857x1.0]kEAnyff8WmkU+yRQV3B0pg==[/tex]使[tex=1.5x1.143]QG5C1TJy1x6rscFKe4vbvg==[/tex]浓度为[tex=5.357x1.214]G+HM2FtNKiyGTpjGw1gwf9bbgyyv6TiZicZACPBLGkQ=[/tex]此时,[tex=27.357x2.571]8CEKSbPlAzH77IvTGmZsEDVe1WrxGFJv9VdtmUO0yZRA48F1z788elnWp7kvKbrHhCjXHFDlL8cxMTCmX24VkK4xdWhiN/T0yj8V/qu7lrC7IXV8y14wmyGv5FL+6ZG2Vl9Bc00h6cP9DRlS0ioecGvFgI41doQGPDMIeEsmNaD0J5hOuf2LAai7dCnGnhXRIAw06eyG1PSHByvKT7WUHQ==[/tex]因此[tex=2.071x1.214]f67h7/Nq7kLZq4HBmj+LUA==[/tex]已经沉淀完全。

    内容

    • 0

      6个顶点11条边的所有非同构的连通的简单非平面图有[tex=2.143x2.429]iP+B62/T05A6ZTM0eeaWiQ==[/tex]个,其中有[tex=2.143x2.429]ndZSw3zT0QTOVLVdoUto1Q==[/tex]个含子图[tex=1.786x1.286]J+vVZa2YaMpc6mJBbqVvWw==[/tex],有[tex=2.143x2.429]lmhx48evnQMhi03NovPXig==[/tex]个含与[tex=1.214x1.214]kFXZ1uR8GjycbJx+Ts2kyQ==[/tex]同胚的子图。供选择的答案[tex=3.071x1.214]3KinXFh3SXhZ7nIe1y9KEV6aadxhhJWeEy6Dij1iObdMUZkY6ZA5J2dVVjPSuhEf[/tex]:(1) 1 ;(2) 2 ;(3) 3 ; (4) 4 ;(5) 5 ;(6) 6 ; (7) 7 ; (8) 8 。

    • 1

      以下创建数组的方式错误的是() A: shortx[];x={1,2,3,4,5,6}; B: shortx[]=newshort[6];x[0]=9;x[1]=8;x[2]=7;x[3]=6;x[4]=5;x[5]=4; C: shortx[]=newshort[6];intlen=x.length;for(inti=0;i

    • 2

      假设“☆”是一种新的运算,若3☆2=3×4,6☆3=6×7×8,x☆4=840(x>0),那么x等于: A: 2 B: 3 C: 4 D: 5 E: 6 F: 7 G: 8 H: 9

    • 3

      下面语句的输出结果是?range(len('HelloWorld')) A: [1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11] B: 11 C: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] D: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]

    • 4

      ‌下面说法错误的是( )。‌‌知识点:列表推导式‌ A: dict([(x, x**2) for x in range(6)]) 创建的字典是{0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25} B: [[x*3+y for y in range(1,4)] for x in range(3)] 创建的是二维列表 [[1, 2, 3], [4, 5, 6], [7, 8, 9]] C: number = [-2, 4, 6, -5]string = 'ab'z = [(i, j) if i>0 else (-i, j) for i in number for j in string]这段代码创建的列表为[(2, 'a'), (2, 'b'), (4, 'a'), (4, 'b'), (6, 'a'), (6, 'b'), (5, 'a'), (5, 'b')] D: ' '.join([i for i in range(1,11)])的运算结果为字符串'1 2 3 4 5 6 7 8 9 10'