漂浮在“死海”水面上静止不动的人，所受浮力大小______他所受重力大小．（选填

阅读下面短文，把A—D四个句子填入文中空缺处，使短文内容完整、正确、然后完成最后小题。

3Dprinters have been around us for some time. There is a lot you can do and image with a 3D printer. ____小题1:____

A company in China has recently used 3D printers to make ten full-sized housed in just 24 hours. ____小题2:____. These houses are printed wth special “ink ”that has been made from industrial construction waste. The using of cheap materials makes it possible to print each house under ＄500小题3:The CEO of the company says , “____小题4:____ ”He plans to set up 100 recycling factories across China and changing waste into cost-effective  “ink ”for 3D printers. ____小题5:____However ,at present ,multi-storeys 3D-printed building are not allowed in China. So,it’s important that the 3D printing technology will be widely used to build any time soon. Maybe there be still a long way  to go.

小题6:According to the passage ,which of the following is TURE?

A．Each of the printed housed costs at least 5000dollars .

B．There’s no limit in China to print tall building with 3Dprinters .

C．The 10full-sized houses are printed out of recycled materials.

D．3D printers will soon caome into commom use to build houses .

根据我国现行《海洋环境保护法》的规定，船舶不得违法排放（）。

Ⅰ．废弃物、污染物；Ⅱ．船舶垃圾；Ⅲ．压载水；Ⅳ．其他有害物质

A．Ⅰ～Ⅲ

B．Ⅰ、Ⅱ、Ⅳ

C．Ⅱ～Ⅳ

D．Ⅰ～Ⅳ

发电机停机以后，不是马上恢复运行，为防止发电机内部（），应解列发电机（），定子内冷水应根据情况投入（）运行。

生产者、销售者在产品中掺杂、掺假，以假充真，以次充好或者以不合格产品冒充合格产品，销售金额（）的，处2年以上有期徒刑或者拘役，并处或者单处销售金额50%以上2倍以下的罚款。

A、5万元以上满20万元

B、20万元以上满50万元

C、50万元以上满200万元

D、200万元以上

在Windows中，鼠标是重要的输入工具，而键盘（）

A.根本不起作用

B.也能完成几乎所有操作

C.只能在菜单操作中使用，不能在窗口操作中使用

D.只能配合鼠标，在输入中起辅助作用（如输入字符）