Luckily, we'd brought a mad map without _______ we would have lost our way. A. it B. that C. this
At that time ,his country was ____ Japan, so hearing from him was extremely difficult. A. at war with B. at the war with C. at war against D. during the war with
已知向量a＝(1，)，b＝(3，m). 若向量a，b的夹角为，则实数m＝( ) A．2 B. C．0
已知一个直径为2米的半圆形工件，未搬动前如图N16，直径平行于地面放置，搬动时为了保护圆弧部分不受损伤，先将半圆作如图所示的无滑动翻转，
现有不纯的锌的样品10g，与足量的稀硫酸充分反应后生成0．2g氢气，求样品中纯锌的质量？
阅读下面的作品，完成小题。 作为“狐狸”的“刺猬” 陈少明 以赛尔·伯林曾把托尔斯泰描述为一只自认为是刺猬的狐狸，但我觉得，他自己却更像
把蜗牛、海葵、蜘蛛分为一类，把锦蛇、青蛙、麻雀分为一类，这是依据( ) A．脊椎骨的有无
Over thirty thousand years ago people from northern Asia（亚洲）went to America. Today, we call these people Indians（印第安人）. The Indians went to America because the weath
