战术资产配置策略只需在期货市场上通过买卖股指期货来实现，无需在股票市场上进行股票交易。
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人格内向者倾向于回避变化不定的活动，对单调、重复性工作耐受性（），较（）出现应激反应。
An alternator switchboard has a synchroscope and synchronizing lamps, if the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus （）
A. The breaker should be closed when one synchronizing lamp is dark and the other is bright
B. The breaker should be closed when both synchronizing lamps are bright
C. The frequency meter should be used to determine that the incoming alternator frequency is slightly higher than the bus
D. A portable phase sequence indicator must be used to verify the information from the lam
软交换设备提供的功能包括（）。
A. 提供多种业务的连接控制功能
B. 路由、网络资源管理功能
C. 计费功能
D. 认证功能
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