When the head teacher was walking past the window, she noticed two students _______ chess in class. She really got _______.
A:playing; annoyed
B:playing; annoying
C:play; annoyed
D:played; annoyed
小云同学在学习了“阿基米德原理”后,发现用弹簧测力计也可以测出液体的密度.
下面是他设计测量盐水密度的实验步骤:(g取10N/kg)
如图甲把一个合金块用细线悬挂在弹簧测力计的挂钩上,合金块的重力G=4N;
读亚洲冬季风和夏季风图,回答问题