已知am=9，an=8，ak=4，则am﹣2k+n= ．
已知am=9，an=8，ak=4，则am﹣2k+n= ．
When does the writing begin in CET-4? A: 10:50 am B: 9:10 am
When does the writing begin in CET-4? A: 10:50 am B: 9:10 am
When does the store open A: 8:30 am B: 9 am C: 5 pm D: 4:30 pm
When does the store open A: 8:30 am B: 9 am C: 5 pm D: 4:30 pm
日本展会展出时间（） A: 9:00 am to 6:00 p.m B: 9:00 am to 6:30 pm C: 10:00 a.m. to 6:00 p.m D: 10:00 p.m. to 6:30 p.m
日本展会展出时间（） A: 9:00 am to 6:00 p.m B: 9:00 am to 6:30 pm C: 10:00 a.m. to 6:00 p.m D: 10:00 p.m. to 6:30 p.m
分析下面的JavaScript代码段，输出结果是（） var str="I am a teacher"; a=str.charAt(9); document.write(a); A: I am a te B: a C: acher D: e
分析下面的JavaScript代码段，输出结果是（） var str="I am a teacher"; a=str.charAt(9); document.write(a); A: I am a te B: a C: acher D: e
I ______ my homework at 9 o’clock last night. A: was doing B: am doing C: did
I ______ my homework at 9 o’clock last night. A: was doing B: am doing C: did
分析下面的JavaScript代码段，输出结果是（ ）var mystring="I am a student";a=mystring.charAt(9);console.log(a); A: I am a st B: u C: t D: udent
分析下面的JavaScript代码段，输出结果是（ ）var mystring="I am a student";a=mystring.charAt(9);console.log(a); A: I am a st B: u C: t D: udent
when did the accident happen ? A. at about 8:00 am B. at about 9:00am C. at about 10:00am
when did the accident happen ? A. at about 8:00 am B. at about 9:00am C. at about 10:00am
某AM信号的功率谱密度为[img=728x43]18036118200bac1.png[/img]该AM信号的调制效率是____ A: 1/9 B: 1/4 C: 1/6 D: 1/3
某AM信号的功率谱密度为[img=728x43]18036118200bac1.png[/img]该AM信号的调制效率是____ A: 1/9 B: 1/4 C: 1/6 D: 1/3
某AM信号的功率谱密度为[img=728x43]1802fbb8b6c7a0e.png[/img]该AM信号的调制效率是____ A: 1/9 B: 1/4 C: 1/6 D: 1/3
某AM信号的功率谱密度为[img=728x43]1802fbb8b6c7a0e.png[/img]该AM信号的调制效率是____ A: 1/9 B: 1/4 C: 1/6 D: 1/3