152. The "scan" function of VHF receiver is used to .
A: monitor Ch 16 continuously and switching to either Ch 70 0r Ch 13 every 5 seconds
B: scan Ch 16 for distress calls
C: scan Ch 70 for distress alerts
D: sequentially scan all or selected channels
A: monitor Ch 16 continuously and switching to either Ch 70 0r Ch 13 every 5 seconds
B: scan Ch 16 for distress calls
C: scan Ch 70 for distress alerts
D: sequentially scan all or selected channels
举一反三
- 智慧职教: Ch 75 and Ch 76 are used as_ for distress channel 16.
- ________被指定为VHF无线电话国际遇险与安全通信频道，俗称公共频道。 A: CH 16 B: CH 06 C: CH 10 D: CH 72
- Which are the preferred frequencies in radiotelephony for on scene cornrnunications? A: 121.5MHz and 2045kHz B: Ch 70 (156.525MHz) and 21 74.5kHz C: Ch 11 (156.650MHz) and 202lkHz D: Ch 16 (156.800MHz) and 2182kHz
- 按要求安装有VHF无线电装置的船舶，站应在（）保持连续值守。 A: CH 60 B: CH 70 C: CH D: CH71
- 判断ch是数字字符的C语言表达式是( ) 。 A: '0' <= ch <= '9' B: ch >= '0' && ch <= '9' C: ch >= '1' && ch <= '10' D: ! (ch < '0' || ch > '9') E: ch >= '0' || ch <= '9'