跟踪接收机的特点是（）。
A.增益高
B.频带宽
C.频带窄
D.精度高
参考答案：C
A1修时，制动盘热裂纹位置距内外边缘小于（）时，裂纹长度须小于65mm
- Shall we climb Nanshan this weekend?
- Good idea! It’s not high. It’s about _____ high.
A．one hundred fifty meters
B．one hundred and fifty meters
C．one-hundered-fifty-meter
D．one-hundred-and-fifty-meter
