早产儿体内脂肪含量低,仅占体重的()
A.1%~2%
B.1%~3%
C.1%~5%
D.3%~5%
E.3%~7%
参考答案:B
天线的增益大小可以说明()。
A、天线对高频电信号的放大能力
B、天线在某个方向上对电磁波的收集或发射能力强弱
C、对电磁波的放大能力
D、天线在所有方向上对电磁波的收集或发射能力强弱
The money collected should be made good use ____________ the people in South Asia who suffered a lot in the earthquake and the tsunami (海啸).
A.of helping
B.to help
C.to helping
D.of to help