决定天线性能优劣的重要技术指标是（）
A.发射功率
B.接收灵敏度
C.增益
D.场型
参考答案：A, B
Obama (奥巴马) _____ president of the USA in November, 2008.
[ ]
A. was elected
B. were elected
C. is elected
D. will be elected
不属于会计核算内容的是( )。
A．用盈余公积转增实收资本B．处理本年度的亏损C．将现金存入银行D．制订下年度财务预算
