【简答题】整圆或大于半圆的圆弧,应注
( )。A. 半径 B. 直径 C. 直径或半径 D. 直径和半径
【单选题】\t正常细胞膜内K + 浓度约为膜外K + 浓度的()
【简答题】整圆或大于半圆应注直径,在尺寸数字前加注符号“ ( )”
【简答题】阅读理解。 根据下面短文内容,选择合适答案。 George liked flying a plane. Once he bought a small plane and learned how to fly it. He soon became so good that he could make his plane do all kinds of tricks(技巧). George had a...
【简答题】用所给词的适当形式填空。 1 Thank you for your _______ (invite). 2. On Wednesday, she has tennis_______ (train) with the school team. 3. The boy often_______ (train) his pet dog to stand on its hind(后部的)legs...
【判断题】整圆或大于半圆应注直径; 小于或等于半圆的圆弧应注半径尺寸。
【单选题】(逆矩阵行列式)设A、 B 为三阶矩阵,且 , ,求 的值。