【单选题】观察法是指人们有目的、有计划地通过感官和辅助仪器,对处于()的客观事物进行系统考察,从而获取经验事实的一种科学研究方法
【单选题】使用51单片机的哪个I/O口必须外接上拉电阻
【简答题】图片和文字之间要保持()行的空格,这样看起来比较清楚。 请填写阿拉伯数字
【单选题】阶方阵 有 个不同的特征值是 与对角阵相似的( ).
【单选题】阶方阵 有 个不同的特征值是与对角矩阵相似的( )
【单选题】观察法是人们有目的、有计划地通过感官和辅助仪器,对处于( )的客观事物进行系统考察,从而获取经验事实的一种科学研究方法。
【单选题】听力原文:W: I found an expensive diamond necklace in the rest room this morning. M: If I were you, I would tarn it in to the security office. What does the man suggest the woman should do?
A.
Turn in the necklace to the security office.
C.
Put the necklace back to the rest room.
D.
Sell the necklace to the security office.
【单选题】What made the peace talks postponed?
A.
The meeting held in Geneva.
B.
The heaviest day of shelling in weeks.
C.
The president's request.
D.
The warning from the mediators.