用于观察肌肉收缩时动作电位的示波器扫描速度为()
A.5ms/cm
B.50ms/cm
C.10ms/cm
D.100ms/cm
E.1000ms/cm
参考答案:C
一名足球守门员沿直线练习折返跑,从球门的位置出发,向前记作正数,返回记作负数,他的记录如下(单位:米):
+5,-3,+10,-8,-6,+12,-10.
(1)当守门员折返跑到最后一次时是否回到了原来的位置?
(2)守门员一共跑了多少路程?
根据句子的意思,用括号中所给汉语提示或英语单词的适当形式填空。(共10小题;每小题1分,计10分)
小题1:They are those _ bags . (child )
小题1:
小题2:Thank you for me the bike. (lend)
小题2:
小题3:I wish our team good .(luck)
小题3:
小题4:Jack is in collecting stamps. (interest)
小题4:
小题5:Mr. White teaches English this term. (we)
小题5:
小题6:Yangzhou is becoming more and more now. (现代化)
小题6:
小题7: is his favorite subject. (地理)
小题7:
小题8:Linda practices badminton every day.(打)
小题8:
小题9:What do you want to tell us? (其它)
小题9:
小题10:Eating vegetables is good for .(健康)
小题10: