FX2系列的PLC的输入端有RUN端，当RUN端和COM端接通时，PLC处于（）状态。_高级中央空调系统操作员_全学科试题题库

当前学科：高级中央空调系统操作员

题目：单选
FX2系列的PLC的输入端有RUN端，当RUN端和COM端接通时，PLC处于（）状态。
答案： <查看本题扣1积分>

查看答案

答案不对？请尝试站内搜索

推荐知识点:

下列（）仲裁裁决为终局裁决。（2014年新增）

完整的插花作品是由（）‚四位一体的创作材料构成

空腹式拱拱轴系数的确定为什么不能用m＝qj/qd式进行？

A Bridge for Squirrels San Francisco has its cable cars. Seattle has its Space Needle. And， Longview has its squirrel bridge. The bridge， which has attracted international attention， is now a local landmark. The Nutty Narrows Bridge was built in 1963 by a local builder， Amos Peters， to give squirrels a way to cross the busy road without getting flattened by passing cars. The original bridge was built over Olympia Way on the west edge of the library grounds. Before the bridge was built， squirrels had to avoid traffic to and from the Park Plaza office building where office staff put out a nutty feast for the squirrels. Many times， Peters and others who worked in and near Park Plaza witnessed squirrels being run over. One day Peters found a dead squirrel with a nut still in its mouth， and that day's coffee break discussion turned into squirrel safety. The group of businessmen cooked up the squirrel bridge idea and formed a committee to ask the blessing of the City Council （市政会）.The Council approved， and Councilwoman Bess LaRiviere jokingly named the bridge "Nutty Narrows". After architects designed the bridge， Amos Peters and Bill Hutch started construction. They built the 60-foot bridge from aluminum and lengths of fire hose （消防水带）. It cost 1000. It didn't take long before reports of squirrels using the bridge started. Squirrels were even seen guiding their young and teaching them the ropes. The story was picked up by the media， and Nutty Narrows became known in newspapers all over the world. In 1983， after 20 years of use， Peters took down the worn-out bridge. Repairs were made and crosspieces were replaced. The faded sign was repainted and in July 1983， hundreds of animal lovers attended the completion ceremony of the new bridge. Peters died in 1984 ，and a ten-foot wooden squirrel sculpture was placed near the bridge in memory of its builder and his devotion to the project. The Nutty Narrows Bridge was built in order to（）. What happened over the coffee break discussion？（） What does the underlined phrase "teaching them the ropes" probably mean in the text？（） Which of the following is true of the squirrel bridge？（） What can we learn about Amos Peters？（）

ACEI抗慢性充血性心力衰竭的药理作用错误的是（）

SAN（storageareanetwork）的传输类型为（）

临界段

皮带秤装秤前的准备工作？

我国生态农业强调运用生态系统的（）和物质循环再生原理，实现经济效益、生态效益和社会效益三结合的农业生产体系。

清后期，曾作为殿试的场所的是下列哪一大殿？（）