备用信用证一般不用于易货贸易与来料加工和补偿贸易业务。 ( )
参考答案:对
They put forward a lot of plans at the meeting, none of ______ carried out in their work.
A.which
B.them
C.what
D.that
如果TD-SCDMA工作在2010~2025MHz频段,在室内覆盖中TD-SCDMA和GSM系统共存需要()dB左右的隔离度,即可规避干扰。
A.15
B.75
C.80
D.35