下列有关匀速直线运动的说法中,正确的是 ( ) A.物体做匀速直线运动的速度大小由运动时间决定
I’m usually fairly skeptical about any research that concludes t hat people are either happier or unhappier or more or less certain of themselves than they were 50 years ago. While any of these stat
如图8-43,在四边形ABCD中,AB=12 cm,BC=3 cm,CD=4 cm,∠C=90°. 图8-43 (1)求BD的长; (2)当AD为多少时,∠ABD=90°?
直接填写计算结果: ()2=___________;
阅读下面的文字,完成后面题 文学新人的“被阅读” 徐则臣 ①打开一本书,如果你不能在60天内看完,那么对不起,你必须跟这本书说再见。阿根廷独
下列物质由肝细胞内核糖体合成的是: ( ) A.转氨酶 B.糖原 C.胆汁 D.尿素
The sentence wants ____ once more. A. explaining B. to explain C. being explained D. explained