图示压杆体系中，弹簧支座刚度为[img=64x44]180379b3117202b.png[/img]，则该体系的临界荷载为kl的（ ）倍。[img=3924x1660]180379b32884d13.jpg[/img] A: 0.411 B: 1 C: 1.645 D: 3.357

图示压杆体系中，弹簧支座刚度为[img=64x44]1802df48734317e.png[/img]，则该体系的临界荷载为kl的（ ）倍。[img=3924x1660]1802df4888c0309.jpg[/img] A: 0.411 B: 1 C: 1.645 D: 3.357

计算下列曲线积分:[tex=8.143x3.786]8LLcY3Ui666htEDzNh5FzUP5/HvLnDyMDRMxvNVaAFMUZUfAegv1tZNwbde7W/N8[/tex],[tex=1.5x1.357]yfrzxbjd3i8zzFcNCokaiw==[/tex]是曲线[tex=10.071x3.357]7EJHVCtO2IWq3KpdB+jQsv6FwiTm8kMJkqqPTKC4ZLAqWxfnHVb/DQwvOZpRVsAxJVv6DWDYLpWVJ6AOEQTss7QvdTLeRCdB1FGCMtGYRGc=[/tex], 其正向是从原点 [tex=2.071x1.357]/B4OpizC+GWNmgu3h9VMGQ==[/tex]看去逆时针方向.

下列函数中，在点[tex=1.857x1.0]UHcHHrIqpHQtT6sZrK29Zg==[/tex]处连续，但是不可导的是(    ).  未知类型：{'options': ['[tex=10.071x3.357]yXywZUmrNA4aqEyepFqydPvLL6K+IhwnVZ2excHqITvX4Op+I8XuIMUx4DZzf36jSasNHD1FWLcNm91Dc5xp7A5SLs5u+Ecqr2fz9q92upu7FWGdJyUJhOUrzDevSDPJ[/tex]', '[tex=12.071x3.357]yXywZUmrNA4aqEyepFqydPvLL6K+IhwnVZ2excHqITsi2/Bsn5Ncmp2A0UNtbbsCE7HIU1GRRP1FyDmHxWksLXYTFw6KWtoHTPureRODbYPL93qq+C6LmVeFHxR1y5xe[/tex]', '[tex=11.714x3.357]yXywZUmrNA4aqEyepFqydIiczW94by3yu5RFMWS//uNjr4r4dV85Y4WlaH982xg1KfN7aGlISCeFiQa9JY7PQRarWLgVTz2ff3WN6AWcy2jE+ExjlqhwsFJsZ91B8a1VnE/K40z7Qxajs/9W2HHSPw==[/tex]', '[tex=10.357x3.357]yXywZUmrNA4aqEyepFqydPvLL6K+IhwnVZ2excHqITu3EeLy8NeUsE9CGYfLFiJOcGOfKF2v+CCmVqnX1RIZDX3EB4dOvRrEhjHo3Gd4/EXheUQFmaStB8GHJuRon3aIJhgwxt37L7l9bdnUKkNogw==[/tex]'], 'type': 102}

下列函数中，在点[tex=1.857x1.0]UHcHHrIqpHQtT6sZrK29Zg==[/tex]处连续，但是不可导的是(    ).  未知类型：{'options': ['[tex=10.071x3.357]yXywZUmrNA4aqEyepFqydPvLL6K+IhwnVZ2excHqITvX4Op+I8XuIMUx4DZzf36jSasNHD1FWLcNm91Dc5xp7A5SLs5u+Ecqr2fz9q92upu7FWGdJyUJhOUrzDevSDPJ[/tex]', '[tex=12.071x3.357]yXywZUmrNA4aqEyepFqydPvLL6K+IhwnVZ2excHqITsi2/Bsn5Ncmp2A0UNtbbsCE7HIU1GRRP1FyDmHxWksLXYTFw6KWtoHTPureRODbYPL93qq+C6LmVeFHxR1y5xe[/tex]', '[tex=11.714x3.357]yXywZUmrNA4aqEyepFqydIiczW94by3yu5RFMWS//uNjr4r4dV85Y4WlaH982xg1KfN7aGlISCeFiQa9JY7PQRarWLgVTz2ff3WN6AWcy2jE+ExjlqhwsFJsZ91B8a1VnE/K40z7Qxajs/9W2HHSPw==[/tex]', '[tex=10.357x3.357]yXywZUmrNA4aqEyepFqydPvLL6K+IhwnVZ2excHqITu3EeLy8NeUsE9CGYfLFiJOcGOfKF2v+CCmVqnX1RIZDX3EB4dOvRrEhjHo3Gd4/EXheUQFmaStB8GHJuRon3aIJhgwxt37L7l9bdnUKkNogw==[/tex]'], 'type': 102}

下列函数中，在点[tex=1.857x1.0]UHcHHrIqpHQtT6sZrK29Zg==[/tex]处连续，但是不可导的是(    ).  未知类型：{'options': ['[tex=10.071x3.357]yXywZUmrNA4aqEyepFqydPvLL6K+IhwnVZ2excHqITvX4Op+I8XuIMUx4DZzf36jSasNHD1FWLcNm91Dc5xp7A5SLs5u+Ecqr2fz9q92upu7FWGdJyUJhOUrzDevSDPJ[/tex]', '[tex=12.071x3.357]yXywZUmrNA4aqEyepFqydPvLL6K+IhwnVZ2excHqITsi2/Bsn5Ncmp2A0UNtbbsCE7HIU1GRRP1FyDmHxWksLXYTFw6KWtoHTPureRODbYPL93qq+C6LmVeFHxR1y5xe[/tex]', '[tex=11.714x3.357]yXywZUmrNA4aqEyepFqydIiczW94by3yu5RFMWS//uNjr4r4dV85Y4WlaH982xg1KfN7aGlISCeFiQa9JY7PQRarWLgVTz2ff3WN6AWcy2jE+ExjlqhwsFJsZ91B8a1VnE/K40z7Qxajs/9W2HHSPw==[/tex]', '[tex=10.357x3.357]yXywZUmrNA4aqEyepFqydPvLL6K+IhwnVZ2excHqITu3EeLy8NeUsE9CGYfLFiJOcGOfKF2v+CCmVqnX1RIZDX3EB4dOvRrEhjHo3Gd4/EXheUQFmaStB8GHJuRon3aIJhgwxt37L7l9bdnUKkNogw==[/tex]'], 'type': 102}

下列函数中，在点[tex=1.857x1.0]UHcHHrIqpHQtT6sZrK29Zg==[/tex]处连续，但是不可导的是(    ).  未知类型：{'options': ['[tex=10.071x3.357]yXywZUmrNA4aqEyepFqydPvLL6K+IhwnVZ2excHqITvX4Op+I8XuIMUx4DZzf36jSasNHD1FWLcNm91Dc5xp7A5SLs5u+Ecqr2fz9q92upu7FWGdJyUJhOUrzDevSDPJ[/tex]', '[tex=12.071x3.357]yXywZUmrNA4aqEyepFqydPvLL6K+IhwnVZ2excHqITsi2/Bsn5Ncmp2A0UNtbbsCE7HIU1GRRP1FyDmHxWksLXYTFw6KWtoHTPureRODbYPL93qq+C6LmVeFHxR1y5xe[/tex]', '[tex=11.714x3.357]yXywZUmrNA4aqEyepFqydIiczW94by3yu5RFMWS//uNjr4r4dV85Y4WlaH982xg1KfN7aGlISCeFiQa9JY7PQRarWLgVTz2ff3WN6AWcy2jE+ExjlqhwsFJsZ91B8a1VnE/K40z7Qxajs/9W2HHSPw==[/tex]', '[tex=10.357x3.357]yXywZUmrNA4aqEyepFqydPvLL6K+IhwnVZ2excHqITu3EeLy8NeUsE9CGYfLFiJOcGOfKF2v+CCmVqnX1RIZDX3EB4dOvRrEhjHo3Gd4/EXheUQFmaStB8GHJuRon3aIJhgwxt37L7l9bdnUKkNogw==[/tex]'], 'type': 102}

下列变量组（）是一个闭回路。 A: {x，x，x，x，x，x} B: {x，x，x，x，x} C: {x，x，x，x，x，x} D: {x，x，x，x，x，x}

以下谓词蕴含式正确的是（）: (∀x) (A(x)→B(x))=>( ∀x)A(x)→(∀x)B(x)|(∀x) (A(x)↔B(x))=>( ∀x)A(x)↔(∀x)B(x)|(∀x)A(x)∨(∀x)B(x)=>( ∀x) (A(x)∨B(x))|(∃x) (A(x)∧B(x))=>(∃x)A(x)∧(∃x)B(x)

以下谓词蕴含式正确的是（）: (?x) (A(x)→B(x))=>( ?x)A(x)→(?x)B(x)|(?x) (A(x)?B(x))=>( ?x)A(x)?(?x)B(x)|(?x)A(x)∨(?x)B(x)=>( ?x) (A(x)∨B(x))|(?x) (A(x)∧B(x))=>(?x)A(x)∧(?x)B(x)