射频导纳液位计具有一内部()振荡器为其提供稳定的信号源
A、高频锯齿波
B、低频正弦
C、高频方波
D、高频正弦
参考答案:D
B. 请根据句意从方框中选择合适的词,并用其适当形式填空,使句子通顺。
小题1:I think this information will make people take action to protect the endangered animals.
小题2:They are children, because they don’t get good food, fresh air and enough exercise.
小题3:Look! Many fans are waiting for the of Yang Mi outside the gate.
小题4:The boy in the picture is Jack . But he doesn’t know it.
小题5:The director passed away peacefully in his house on a morning.
与骨盆最 * * 面有关的是()。
A、坐骨结节
B、坐骨棘
C、骶岬
D、耻骨联合上缘
E、骶尾关节