【简答题】用方框中所给单词的适当形式填空,使短文通顺、正确、连贯(每个单词限用一次) Hangzhouhua (杭州话):use it or lose it There are about 6.000 languages in the world and some experts say that as many as half of these languages will disappear(消失) i...
【简答题】用方框中所给词完成句子。 took part in, hungry, improve, population, describe, strict with, tidy, introduce, learn from, practice 1. The best way to ______ your English is to join an English club. ...
【简答题】已知抛物线C:x 2 =2py(p>0)上的一点Q(m,2)到其焦点F的距离为3。 (1)求抛物线C的方程; (2)过坐标平面上的点F'作抛物线C的两条切线l 1 和l 2 ,分别交x轴于A,B两点。 (i)若点F'的坐标为(0,-1),如图,求证:△ABF′的外接圆过点F; (ii)试探究:若改变点F'的位置,或抛物线的开口大小,(i)中的结论是否仍然成立?由此给出一个使(i)中的结论成立的命题...
【判断题】护岸工程的目的是阻止河岸的侵蚀和渗流,增加河流的横向稳定性。()
【单选题】土石坝渗流计算的目的是( )
A.
检验坝的初选形式与尺寸,确定渗流力以核算坝坡稳定
B.
根据坝内的渗流参数与逸出坡降,确定坝体及坝基中防渗体和排水设施
【简答题】用方框中所给单词完成句子。 really , cousin , traffic , cost , exciting ,comedies ,meeting , easier, fan , ticket 1. We can't go to the concert without a____. 2. He's a real football____so is his father. 3. It's _...
【简答题】用方框中所给词的适当形式完成句子。 pronounce, different, mistake, face Tom came from the south of the country. In our language class, our teacher asked him ___ 1 __the word but his __ 2 ___ was strange. We all...
【单选题】土石坝渗流计算的目的是( )
A.
检验坝的初选形式与尺寸,确定渗流力以核算坝坡稳定;
B.
根据坝内的渗流参数与逸出坡降,确定坝体及坝基中防渗体和排水设施。
C.
确定通过坝及两岸的渗流量并设计排水系统的容量。