A. level
B. legality
C. leisure
D. legend
第1题:
A.written
B.write
C.wrote
第2题:
A. Half-duplex Ethernet operates in a shared collision domain.
B. Full-duplex Ethernet has a lower effective throughput.
C. Half-duplex Ethernet operates in a private collision domain.
D. Full-duplex Ethernet allows two-way communication.
E. Half-duplex Ethernet operates in a private broadcast domain.
第3题:
第4题:
b)
main()
{
union{ /*定义一个联合*/
int i;
struct{ /*在联合中定义一个结构*/
char first;
char second;
}half;
}number;
number.i=0x4241; /*联合成员赋值*/
printf("%c%c\n", number.half.first,
mumber.half.second);
number.half.first='a'; /*联合中结构成员赋值
*/
number.half.second='b';
printf("%x\n", number.i);
getch();
}
AB (0x41 对应'A',是低位;Ox42 对应'B',
是高位)6261 (number.i 和number.half 共用一块地址空
间)
第5题:
You are signing on a deck officer,who will be designated as one of the GMDSS operators,before sailing foreign.Which statement is TRUE ________.
A.He/she must have an STCW certificate endorsed as“Valid for Service on Vessels Operating in the GMDSS System”
B.He/she must present either an FCC-issued license or a Coast Guard-issued license
C.You must consult the“List of Qualifications”on the reverse of his/her FCC-issued license
D.His/her Merchant Mariners Document must have an added endorsement as “Radio Electronics Officer”
第6题: