什么时候可以退出开式水系统?

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问题:

什么时候可以退出开式水系统?

考点:汽机巡检员考试汽机巡检员考试题库
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Some students who are from all around the world are talking about the way they go to school on School Bus Bar at http://tieba.baidu.com/.
In our country, most of the students go to school by school bus. For me, I go to school by school bus every day. It takes me about 30 minutes to get to school, because my home is far from the school. The school bus is not only beautiful but wide and strong. It makes me feel safe when I am in school bus.
Mary Smith from America
I think riding is one of the best ways to go to school because my school isn’t very far from my home. It takes me about 15 minutes. I like riding a bike and I think it’s good for my health. But nowadays, the number of the cars is becoming larger and larger and the crowded traffic will certainly bring about the risk of safety. So my parents hope that I can take the school bus to school.
Li Ping from Wenzhou
I went to school by bus one month ago, but now I walk to school with my parents or my classmates. It’s because the school bus accident. In the accident, lots of students died. I have to get up one hour earlier than before. I spend one and a half hours getting to school. And now it’s very cold outside. I hope to have a school bus.
Bing Bing from Jiangsu
小题1:Mary Smith’s school bus isn’t ______.
A.safeB.beautifulC.strongD.dangerous
小题2:Why does Li Ping go to school by bike?
A.Because she likes riding.
B.Because the crowded traffic.
C.Because her school is far.
D.Because there is no school bus.
小题3:How long does Bing Bing spend on the way to school?
A.30 minutesB.15 minutes
C.one hourD.one and a half hours
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Not until I came home last night ______ to bed .

A.Mum did go

B.did Mum go

C.went Mum

D.Mum went

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如图甲所示,理想变压器原、副线圈的匝数比为55:9,副线圈接有一灯泡L和一电阻箱R,原线圈所接电源电压按图乙所示规律变化,此时灯泡消耗的功率为40W,则下列说法正确的是

A.副线圈两端输出电压为36V

B.原线圈中电流表示数为A

C.当电阻R增大时,变压器的输入功率减小

D.原线圈两端电压的瞬时值表达式为V

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俄罗斯前总统普京曾这样说:“谁要是不为苏联解体而感到遗憾,他就是没有心肝;谁要是想恢复原来模样的苏联,他就是没头脑。”对这句话理解准确的是[ ]

A.总结苏联历史只能用理解思考,不能带有任何感情色彩

B.为社会主义在苏联的失败感到遗憾,但认为苏联解体是必然的

C.统一的苏联的解体是遗憾的,高度集中的政治经济体制的失败是必然的

D.俄国的历史只能向前发展,苏联的解体是历史的进步

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网银诈骗是银行卡犯罪主要方法之一。

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