代森锰锌不溶于水及大多数有机溶剂,遇()易分解。A、酸和碱 B、酸 C、碱 D、强酸 发布时间:2020-03-21 16:30 │ 来源:www.tikuol.com 题型:单项选择题 问题: 代森锰锌不溶于水及大多数有机溶剂,遇()易分解。A、酸和碱B、酸C、碱D、强酸
题型:单项选择题 已知a,b,c为△ABC的三个内角A,B,C的对边,向量m=(cosA,sinA),n=(1,3),若m⊥n,且acosB+bcosA=csinC,则角B=( )A.π6B.π3C.2π3D.5π6 查看答案
题型:单项选择题 根据句意及所给首字母的提示写出所缺单词。1.-What does CRI s________ for? -China Radio International.2.My parents always e________ me to study hard.3.We'll have a basketball match a________ Class One.4.He is going to write a r________ for China Daily.5.She trains very hard and she is not an overnight s________. 查看答案