下列哪些作战保障行动不具有一定的作战功能：（）
A、通信保障
B、联合防护
C、情报保障
D、电磁频谱管理
参考答案：A
The father as well as his three children _____ skating on the frozen river every Sunday afternoon in winter.[ ]
A. is going
B. go
C. goes
D. are going
Romberg Sign阳性是下述哪种疾病的典型表现（）
A.脑干病变
B.小脑病变
C.前庭病变
D.脊髓后角病变
E.基底部病变
