如图所示，竖直平面内的直角坐标系中，X轴上方有一个圆形有界匀强磁场（图中未画出），x轴下方分布有斜向左上与Y轴方向夹角θ=45°的匀强电场；在x
“Is your car equal _______ hers in speed?” “No, mine is faster. But my old one equals _______ hers in speed.” A. to, to B. 不填, 不填 C. to, 不填 D. 不填, to
钠原子的原子核中有11个质子和12个中子，钠原子的核外电子数为( ) A．23 B．11 C．12 D．1
They are hoping ________ a nice weekend after the busy week. A. for B. to C. about D. with
“旧时代的最后一位诗人，同时又是新时代的最初一位诗人”但丁的代表作是 A．《神曲》 B．《蒙娜丽莎》 C．《最后的晚
某校生物兴趣小组的同学想进行如下两个实验。 实验1：探究尿液中是否含葡萄糖。 实验2：证明血液中存在葡萄糖。 现提供：新取尿液样品、加有柠檬
A Welcome Gift Dario and his mother loved their new apartment. The living room was large enough for their piano. That night, the two of them 1side by side at the piano. They played jazz music to
（2010·黑龙江大庆实验中学高三第二次月考）25. There was a time in the USA when the money spent on educating a black child was just one fourth of _____ spent on each white child. A. i
在定义域
上是减函数，且
，则
的取值范围是 . 
