-MissLiu,Iamterriblysorry.Ileftmyphysicsexercisebooksathome.-()A.I'msorrytohearthat.B.That'sallright.C.Notatall.D.You'rewelcome.
-Miss Liu,I am terribly sorry.I left my physics exercise books at home.
-________( )
A. I'm sorry to hear that.
B. That's all right.
C. Not at all.
D. You're welcome.
matlab matlabc=40r=120a=96o=20y=3(角度)f=0.2[x]=sol 2020-05-16 …
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下列各选项中的M与P表示同一个集合的是()A.M={x∈R|x2+0.01=0},P={x|x2=0 2020-10-31 …
函数fn(x)=xn+bx+c(n∈Z,b,c∈R).(1)若n=-1,函数f(x)在区间[2,+∞ 2020-10-31 …
x,y,z,a,b,c,r>0证明:x+y+a+b/x+y+a+b+c+r+y+z+b+c/y+z+ 2020-11-01 …
A={(X,Y)|X+Y=c,c∈R}B={(X,Y)|X2+Y2=R2,R>0}这时A∩B有多少个 2020-12-23 …