15.—HelloisthatSamspeaking?—I'msorryheisn’tinatthemoment.A.Whoareyou?B.CanIleaveamessage?C.Whatareyoucallingfor?D.CanItakeamessage?
15. —Hello is that Sam speaking?
—I'm sorry he isn’t in at the moment.____
A. Who are you?
B. Can I leave a message?
C. What are you calling for?
D. Can I take a message?
下列判断正确的个数有:①若a,b同号,则a+b=|a|+|b|②若a,b异号,则a,b=|a|-| 2020-04-27 …
已知实数a,b满足a+b=8,ab=15,且a>b,试求a-b的值解a+b=8,ab=15（a+b 2020-05-17 …
已知f(X)=Lg1-X/1+X,a,b属于(-1,1)求证:f(a)+f(B)=F(A+B)/1 2020-05-22 …
下列结论不正确的是（）A.若a＞0,b＞0,则a+b＞0B.若a＜0,b＜0,则a+b＜0C.若a 2020-07-09 …
向量a的模=13,向量b的模=19,|a+b|=24,求|a-b||a+b|^2=|a|^2+|b 2020-07-19 …
—IwanttospeaktoTom.—Heisn'there.?A.CanItakeamessa 2020-07-26 …
初中英语17:A:theclothingfactory.goodmorningB:.canispe 2020-07-26 …
集合的运算1.已知A={1,2,3,4},B={3,4,5},求A交集B,A并集B.2.已知A={ 2020-07-30 …
补全对话A:Hello?B:Hello.MayINeil,please?A:calling.plea 2020-11-10 …
已知：n=1a^2-b^2=(a-b)(a+b)；a^3-b^3=(a-b)(a^2+ab+b^2) 2020-12-23 …