为防止断路器多次重合于永久性故障，重合闸装置接线中设置的继电器是（）。
A.差动继电器
B.阻抗继电器
C.方向继电器
D.单相继电器
参考答案：D
George Soros, CFA, is a private lender in a local bank. Soros will lend money at a stated annual rate of 10% and compounded continuously. The principal and interest are paid at the end of the loan term. If Soros will lend€20000000 for 200 days, based on 365 days in a year, the amount due at the end of the loan term is closest to:（）
A. ￥21095890
B. ￥21126471
C. ￥21142555
计算题：用φ89mm×4.5mm无缝弯管弯制的管路如图所示，求所需管材的长度和质量是多少（φ89mm×4.5mm无缝管的单位长度质量为9.38kg/m）？
