【单选题】----He was nearly drowned once . ---- When was ______? -----_____ was in 2000 _____he was in middle school .
【判断题】f(t)=cos(10t)+cos(30t)是否是周期信号。
【单选题】以下各选项中的代码段执行后,变量 y 的值不为 1 的是
A.
int x=10,y=0; if(x=y) y=1;
B.
int x=5,y=0; if(x) y=1;
C.
int x=5,y=0; if(5) y=1;
D.
int x=5,y=10; if(x=y) y=1;
【单选题】以下各选项中的代码段执行后,变量y的值不为1的是
A.
int x=5,y=0; if(x) y=1;
B.
int x=5,y=0; if(5) y=1;
C.
int x=10,y=0; if(x=y) y=1;
D.
int x=5,y=10; if(x=y) y=1;
【单选题】So seriously _____ in the accident that he was sent to hospital at once.
【单选题】--- He’s never late for school, _____ he? ---_______________, but once he asked for a sick leave(病假).
【单选题】周期信号cos(10t)-cos(30t)和ej30t的周期T分别为____和____.
【单选题】----- He was nearly drowned once. ----- When was ____? ------ _____was in 1998 when he was in middle school.
【简答题】He once worked in a company, ______ he went abroad for further study. A. from which B. after that C. after which D. from this
【判断题】f(t)=cos(10t)-cos(30t)是为周期信号