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【单选题】
放在水平地面上的物块，受到一个与水平方向成【图片】角斜向下方的力F的作用，物块在水平地面上做匀速直线运动，如图所示。如果保持力F的大小不变，而使力F与水平方向的夹角【图片】变小，那么，地面受到的压力N和物块受到的摩擦力f的变化情况是【图片】A.
N 变小， f 变大
B.
N 变大， f 变小
C.
N 变小， f 变小
D.
N 变大， f 变大
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【简答题】气动三大件主要是 (________) 、 (________) 和 (________) 。
【简答题】What did da Vinci's research focus on?
【多选题】What mistakes did Richard make?
A.
He clashed with a group of nobles.
B.
He was unable to accept any challenge to his authority.
C.
He seized the inheritance left to his cousin
【单选题】What did da Vinci appreciate most in Nature?
A.
Its complex design.
B.
Its delicate arrangement.
C.
Its simplicity.
【简答题】What mistakes did Rich make at the dinner table?
【简答题】What mistakes did the writer make at first?
【简答题】What mistakes did the speaker make several years ago and how did he deal with it ?
【简答题】气动三大件主要是 (________) 、 (________) 和 (________) 。
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