单台送、引风机跳闸如何处理？

对于某些离子的检验及结论一定正确的是（　　）

A．加入稀盐酸，产生无色并能使澄清石灰水变浑浊的气体，一定有CO₃^2-

B．加入BaCl₂溶液有白色沉淀产生，再加盐酸，沉淀不消失，一定有SO₄^2-

C．某气体能使湿润红色石蕊试纸变蓝，该气体一定显碱性

D．加入碳酸钠溶液产生白色沉淀，再加盐酸白色沉淀消失，一定有Ba²⁺

小题1:In the past, some cultures used tattoos as an a_________ to costumes.

小题2:Learning English as a foreign language is very difficult in the a_________ of a native language environment.

小题3:To a_________ a high level of fluency and accuracy in a foreign language, you need to be surrounded by it.

小题4:Inner beauty refers to the kind of attraction found in a wide r_________ of personal qualities.

小题5:I didn’t have any money left, so I went to the bank to c_________ a cheque.

小题6:I asked my daughter to help make the decision, as I believe she is m_________ enough.

小题7:In a foreign country, you can n_________ the price by using your fingers.

小题8:There is no c_________ view on beauty.

小题9:Eye r_________, I see the moon so bright.

小题10: Rowan had some speaking problems in his childhood, so he c_________ for this by talking very deliberately.

小题11:“Beauty and Beast” c_________ a message that should be evident to all of us—you shouldn’t judge a book by its cover.

小题12:Mr. Bean creates humour through a s_________ of simple and funny acts.

小题13:Body language can therefore make people’s feelings more t_________ as it is not easy to lie with our bodies.

小题14:He finds the taste of the raw hamburger truly d_________.

小题15:Black humour finds the funny side of sad or d_________ events.

小题16:The “OK” gesture in America can c_________ offence in Germany.

小题17:A person who is feeling uncomfortable will often hold their body in a very r_________ manner, and have a t_________ look about their mouths.

小题18:Romanticism was a literary and a_________ movement.

小题19:Smile is one form of body language that receives u_________ approval.

肩手综合征治疗不正确的是（）

A.应确保腕关节处于完全掌屈位

B.卧位时，适当抬高患侧上肢

C.应练习使伸展的患侧上肢的持重活动

D.被动运动患侧上肢

E.不宜冷疗

数控机床中的NC限制和机床限制是完全相同的性质.

国家对（）实行安全生产许可制度。

A.矿山企业

B.建筑施工企业

C.交通运输企业

D.房地产开发企业

E.民用爆破器材生产企业