【单选题】西塞罗认为,雄辩家应具备()、礼让和同情的品质。
【简答题】有下列命题: ①设集合 M ={ x |0$amp; x≤3}, N ={ x |0$amp; x≤2},则“ a ∈ M ”是“ a ∈N”的充分而不必要条件; ②命题:“若 a ∈ M ,则 b M ”的逆否命题是:若 b ∈ M ,则 a M ; ③若 p ∧ q 是假命题,则 p 、 q 都是假命题; ④命题 P :“ x 0 ∈R, x - x 0 -1>0”的否定 P :“ x ∈R,...
【判断题】电压源型变频器不适用于多电动机传动,适用于一台变频器给一台电动机供电的单电动机传动
【单选题】已知双曲线 x 2 a - y 2 a 2 +a+1 =1 的离心率的范围是数集M,设p:“k∈M”; q:“函数f(x)= lg x-1 x-2 x<1 2x-k x≥1 的值域为R”.则P是Q成立的( )
【单选题】By the time Jack returned home from England, his son________from college. [ ]
【单选题】设a、b、c∈R + ,P=a+b-c,Q=b+c-a,R=c+a-b,则“PQR>0”是“P、Q、R同时大于零”的 ( )
【单选题】有下列命题: ①设集合M={x|0<x≤3},N={x|0<x≤2},则“a∈M”是“a∈N”的充分而不必要条件; ②命题“若a∈M,则b?M”的逆否命题是:若b∈M,则a?M; ③若p∧q是假命题,则p,q都是假命题; ④命题P:“ ? x 0 ∈R, x 20 - x 0 -1>0 ”的否定¬P:“?x∈R,x 2 -x-1≤0” 则上述命题中为真命题的是( )
【单选题】听力原文:College graduates should by all means hunt for a job. But they should first think over what they really want to get. (29)
A.
Only college graduates need to look for a job.
B.
No matter how difficult it is, college students should at least try twice to hunt for a job.
C.
College graduates should consider what they want to gain in the job.
D.
Once you get a job, you will feel superior to others.
【单选题】By the time Jack returned home from England, his son _____ from college. [ ]
【判断题】3电压源型变频器不适用于多电动机传动,适用于一台变频器给一台电动机供电的单电动机传动。