泄漏电流带电检测主要是测量避雷器的全电流和阻性电流基波峰值，根据这两个值的变化来判断避雷器内部是否（）、金属氧化物阀片是否发生劣化等。
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Which Cisco CRS 4.0 server configuration task enables the Cisco CRS server to fail over to a secondary Cisco Unified CallManager when the primary Cisco Unified CallManager fails?（）
A. The LDAP directory must have a secondary profile configured.
B. No special configuration is required. Cisco Unified CallManager maintains the failover.
C. The JTAPI provider on the Cisco CRS server must be configured with the secondary Cisco Unified CallManager IP address following the primary Cisco Unified CallManager IP address.
D. There must be a second JTAPI user configured with an alternate range of CTI ports.
“坏账准备”科目的余额（）。
A. 可能在借方
B. 可能在贷方
C. 可能等于零
D. 一定在贷方
片材长度的允许偏差为±10％。
A. 正确
B. 错误
长、短期平均成本曲线都呈U形，都是由边际报酬递减规律造成的。
A. 正确
B. 错误
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