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Gear-type flexible couplings are often used in diesel engine drive trains because they（）
A. require no lubrication under normal operating conditions
B. compensate for gross misalignment in the drive train
C. are able to transmit high torque ,even where slight misalignment exists
D. will rapidly disconnect the engine from the line shaft
随着接入电网的（）不断增长，要求电网提高资源配置能力、扩大输电范围。
“两不愁三保障”：稳定实现扶贫对象（）、（），（）保障、（）保障和（）保障。
Which operation requires that you create an auxiliary instance manually before executing the operation？（）
A. Backup-based database duplication.
B. Active database duplication.
C. Tablespace point-in-time recovery.
D. No operation requires the creation of an auxiliary instance.
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