Nosoonerthemselvesintheirseatsinthetheatrethecurtainwentup.()A.theyhavesettle;beforeB.hadtheysettled;thanC.havetheysettled;whenD.theyhadsettled;than
No sooner _______ themselves in their seats in the theatre______ the curtain went up.( )
A. they have settle; before
B. had they settled; than
C. have they settled; when
D. they had settled; than
一辆汽车从A地出发,先行驶了S。米后,又以每秒v米行驶了t分钟,汽车行驶的全部路程S(米)等于A. 2020-05-14 …
在公式s=s0+vt中,当t=5时,s=260;当t=7时,s=340.则此公式为()A.s=60 2020-07-20 …
等差数列的前n项和,前2n项和,前3n项的和分别为S,T,R,则()A.S2+T2=S(T+R)B 2020-07-20 …
用字母表示数量关系.(1)a表示工作效率,t表示工作时间,S表示工作总量S=a=t=(2)v表示速 2020-07-26 …
第一步推论看不懂设S={(x,y)|x2-y2=奇数,x,y∈R},T={(x,y)|sin(2π 2020-07-30 …
若把(s+t)、(s-t)分别看作一个整体,指出下面式子中的同类项.1.3分之1(s+t)-5分之 2020-08-01 …
设集合A是N*的某个有限子集,集合S={(a,b)|a∈A,b∈A,a+b∈A},集合T={(a, 2020-08-01 …
设S,T是两个非空集合,且它们互不包含,那么S∪(S∩T)等于()A.S∩TB.SC.∅D.T 2020-08-01 …
S=Vt,(V与t都大于零)如果V一定,那么t和S成()比例.A.正比例B.反比例C.不成比例D.无 2020-11-28 …
物体自由落体运动方程为s(t)=12gt2,若limn→∞s(1+△t)−s(1)△t=g=9.8m 2021-01-22 …