A:x﹣4y﹣11=0
B:x+4y+13=0
C:3x﹣4y﹣9=0
D:3x+4y+15=0
如图所示,灯重30 N,灯挂在水平横杆的C端,O为杠杆的支点,水平杆OC长2 m,杆重不计,BC长0.5 m,绳子BD作用在横杆上的拉力是多少?(∠DBO= 30°)
(____)He wants to play baseball.
(____)Tim was so happy because he got a gift.
(____)Why are you wearing a Tshirt?
(____)I am going to the cinema tomorrow.
(____)It's difficult to fly a kite.
在下面的横线上填写处相应的句子。