《智能变电站合并单元技术规范》规定，合并单元的输入输出应采用光纤传输系统，兼容接口是

已知圆的半径为5cm，一条弦的长为6cm，则这条弦的弦心距为______cm．

单词拼写

1. The bags on _____(销售)are fifteen yuan each.

2. My sister likes to go to that _______(服装)store to buy clothes.

3. The boy in _______(白色的), not the one in black, is his cousin.

4. You can buy the shirt for eight ______ (美元) or twenty RMB yuan.

5. They ______ (卖) the soccer balls for only ￥40.

6. Green, yellow, black and red are all c______.

7. The white pants are too s _______ for Jim, but the black pants are too long for him.

8. Come and see for y_______ at Xingfu Clothes Store.

9. —What’s the p_________ of this bird?   —It’s 100 yuan.

They were playing in the garden        they heard a scream .

A．while

B．as

C．until

D．when

如果施工涂层的湿膜厚度为200微米，体积固体份为60%，那么干膜厚度则为：（）

A、80微米

B、100微米

C、120微米

D、150微米

如图所示，一斜面固定在水平地面上，质量不相等的物体，A、B叠放后．一起沿斜面下滑，已知物体B的上表面水平，则下列判断正确的是（　　）

A．若A、B一起匀速下滑，增加A的质量，A、B仍一起匀速下滑

B．若A、B一起匀速下滑，给A施加一个竖直向下的力F，A、B将加速下滑

C．若A、B一起加速下滑，增加A的质量，A、B仍保持原来的加速度一起加速下滑

D．若A、B一起加速下滑．给A施加一个竖直向下的力F，A、B仍保持原来的加速度一起加速下滑