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'
内容
- 0
满足字符变量ch是回车或者数字的C语言表达式是。 A: ch== ' \n'|| '0' =<; ch<;= '9' B: ch== ' \n'&&ch>;= '0' && ch<;= '9' C: ch== ' \n'|| ch>;= '0' && ch<;= '9' D: ch== ' \n'|| ch>;= '0' ||ch<;= '9'
- 1
判断char型变量ch是否为数字字符的正确表达式是 ( )。 A: '0'<=ch<='9' B: ('0'<=ch)||(ch<= '9') C: ('0'<=ch)&&(ch<='9') D: ('0'<=ch) and (ch<='9')
- 2
判断一个char型变量ch是否为数字字符的正确表达式为（ ）。 A: (ch>='0') && (ch<='9') B: ('0'<=ch<='9') C: (ch>='0'&& ch<='9') D: (ch>=0) &&(ch<=9)
- 3
有以下程序 #include main( ) { char ch[] = "abc"; ch[0] ^= ch[0]; ch[1] |= ch[1]; ch[2] &= ch[2]; printf("%d%c%c\n",ch[0],ch[1],ch[2]); } 程序运行后的输出结果是
- 4
In Listening part, you'd better ____________ before starting? A: scan all the choices in this part B: scan all the choices in Section A C: scan all the choices in Section B D: scan all the choices in Section C