利用横道图表示建设工程进度计划，其局限性之一是不能（）。 A.直观反映各项工作的持续

下列说法错误的是（　　）

A．若物体在某段时间内每一时刻的瞬时速度都等于零，则它在这段时间内的平均速度一定等于零

B．速度越大，位置变化越快，位移也就越大

C．瞬时速度可看作时间趋于无穷小时的平均速度

D．瞬时速度是物体在某一时刻或在某一位置时的速度

三个连续自然数的最小公倍数为660，则这三个数分别是______．

正三棱柱体积为16，当其表面积最小时，底面边长a＝________.

根据要求写出下面词的适当形式。

1. —How many  ______ (月份) are there in a year?

    —Twelve.

2. It's Lucy's ______ (女衬衫). It's very new.

3. It's too far away from our school. Let's ______ (乘) a bus to get there.

4. Lucy spends half an hour a day ______ (看) TV.

5. Listen! They are ______ (聊天) with each other in the room.

6. T______ is the third day of a week.

7. Millie isn't pretty, but she is p______, we all like her very much.

8. The windows and the doors are ______ (not open). It's hot (热的) in the room.

9. June 1st is ______ (child) Day. My daughter likes that day best.

10. My Cousin Kitty wants to ______ (be) a teacher like her mother.

顶梁铰接完整，铰接率大于90％，连续不铰接不得超过（）棚。

A.五

B.三

C.二

D.四