材料具有亲水性或憎水性的根本原因在于材料的分子结构 （）
A. 正确
B. 错误
u＝－100sin（3πt＋10°）V超前i＝5cos（6πt－15°）A的相位差是（）
A. 25°
B. 95°
C. 115°
D. 无法判断
You are trying to change the polling parameters used by the location manager via the cisco wcs， and your request is being denied. What is wrong？（）
A. polling values can be changed only in the maintenance window.
B. polling values can be changed only on the location server.
C. your login does not have the correct permissions.
D. you must wait for the location server to become available.
分析天平的感量为（）克
A. 0.1
B. 0.01
C. 0.001
D. 0.0001
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