陆上巡航舰和普拉多

42.Suring their first teacher-training year,the students often visited local schools for the __D___ of lessons.A.examination B.inspection C.investigation D.observation44.He badly ___C___ his back digging in the garden last Sunday.A.stretched B.exerte 根号3十2和根号3一2是一元二次方程的两个根,那么这个一元二次方程是什么 1.Anyway,she had lived with him for ten years before she divorced him,so think not_his death broke her heart.A.that B.but C if D.makes2._ she was,she did as well as men.A women as B.women thoughC women that D.A women is 两道英语选择题,求分析!谢谢!46. I hope you are not __A_____ that I obtained this money dishonestly. A. implying B. concerning C. involving D. conveying49. A good deal of the _____C__ for their success must go to John Francis, Do you mind my somking here?I am afraid I do.people __not to smoke in the reading room.A are requesting B request C are requested Dwill requestthe American girl has a good__ of Chinese and can express herself freely in the language .A item B series C 解方程组ax+by=1,cx+dy=-1时,甲因把c看错了,得到x=-19/6,y=-3/2乙因把d看错了,得到x=-6,y=-19/7求ab 解方程组ax+by=1,cx+dy=-1时,甲因把c看错了,得到x=负六分之十九,y=负二分之三；乙因把d看错了,得到x=-6,y=负七分之十九,求a、b的值. 解方程组{ax+by=1 cy+dy=-1时,甲因把c看错了得到x=-19/6 y=-3/2,乙因把d看错,得到x=-6 y=-19/7快,十分钟之内错了是解方程组{ax+by=1 cx+dy=-1时，甲因把c看错了得到x=-19/6 y=-3/2，乙因把d看错，得到x=-6 y=-19/7 方程x^2+y^2+4mx-2y-m=0曲线是圆的充要条件是 已知椭圆x2/4+y2/3=1,过椭圆的左焦点且平行于向量v=（1,1）的直线交椭圆与A,B两点,求弦AB的长. 求方程x2+y2+4mx-2y+5=0表示圆的充要条件 4、已知圆C的方程为x2+y2+4x－2y=0,经过点P（－4,－2）的直线l与圆C相 交所得到的弦长为2,求直线l 函数极限的局部有界性证明中,|f(x)－A|+|A|＜|A|+1 这个是为什么?你的意思是不是由｜f(x)-A| 证明函数f(x)= 1/xcos1/x在去心邻域（0,a)内无界,其中a>0 污水不能排入雨水井内国家有哪些规定 已知关于x、y的方程组ax+by=c,ex+dy=f的解为x=3,y=1,则关于x、y的方程组a（x-y）+b（x+y）=c,e（x-y）+d（x+y）=f的解是多少? M是椭圆x^2/9+y^2/4=1上一点,F1,F2是椭圆的两个焦点,I是△MF1IF2的内心,延长MI交F1F2于N,则|MI| ：|IN|=? 已知M是椭圆x^2/a^2+y^2/b^2=1(a>b>0)上的一点,左右焦点为F1,F2,点p是△MF1F2的内心连接MP并延长交已知M是椭圆x^2/a^2+y^2/b^2=1(a>b>0)上的一点,左右焦点为F1,F2,点p是△MF1F2的内心,连接MP并延长交F1F2与点N, 已知M为椭圆x^2/5+y^2/4=1上一点,F1,F2为椭圆的两焦点,若角F1MF2=30°,试求三角形MF1F2的面积 已知椭圆x^2/25+y^2/16=1,F1,F2为焦点,M为椭圆上的点,若△MF1F2的内切圆的面积为9π/4,则这样的点M的个数 已知a²+2ab+2b²-6b+9=0,求a-b的值 ‘我知道答案’ 英语翻译咋翻译啊. 英语翻译不太想用If you have any question please feel free to contact me和If you have any question please feel free to let me konw这两句.有没其它的表达方式? 我知道我要的是什么.翻译成英文又或者是我知道什么是我想要的.是这个意思就行 椭圆x2/a2+y2/b2=1 过点（0,1）f1 f2分别为椭圆的左右焦点 且|f1f2|=2 求该椭圆的标准方程 AB为过椭圆x^2/a^2+y^2/b^2=1中心的弦,F(c,0)为椭圆的右焦点,则三角形AFB面积的最大值是 设AB是过椭圆中心的弦,F是椭圆的一个焦点.则三角形ABC最大面积?椭圆为x^2+2y^2=1 方程x^2+y^2+4mx-2y+5m=0表示圆的充分不必要条件是 A.m小于等于1/4 B.m>1 C.m>1或 方程X^2+Y^2+4X-2Y+5M=0表示圆（1）求此时m的集合（2）设b=m^2+2m+2,求b的取值范围. 已知（a+b）²+|2b-1|=0,求6ab-2ab-3（ab-1）的值 外语选择题目.. 要分析下下..It wasn't until nearly a month later___I received the manager's reply. A since B when C as D that 答案是dSome studies even suggest that playing more___bigger brains that are___at reasoning and learning. A refe 1.Two days isn’t enough for me to finish the work.I need____day.A.a third B.the third C.the other D.other2.There are four____and two____at the____.A.Johns,Marys,doctors B.Johns,Marys,doctor’sC.John’s,Mary’s,doctor’s D.John,Mary,doctor’s3.