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问题 单项选择题

装置中管线吹扫，按物料介质不同，分别在逐条管道中进行吹扫，应（）。

A、先吹总管，后吹支管

B、先吹支管，或吹总管

C、同时吹总管和支管

D、无先后限制，自由吹扫

答案

参考答案：A

改错题

假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文,文中共有10处错误,每句中最多有2处.错误涉及一个单词的增加,删除或修改.

增加:在缺词处加上一个漏字符号(︿),并在其下面写上该加的词.

删除:把多余的词用斜线(\)划掉.

修改:在错的词下划一横线,并在该词下面写上修改后的词.

注意:1.每处错误及其修改均仅限一词.

2.只允许修改10处,多者(从第11处起)不算分.

It is interested to visit another country， but sometimes there are some questions if we don’t know the language very well． It may be difficult to talk about the people

there．We may not know how to use the telephone in the country which are visiting． We may not know what to buy the things we need． In a strange country, we may not know where to eat and what to order in a restaurant． It is not easy to decide how many money to tip（付小费） waiters or taxi drivers． When we were helpless， we may not know how to ask help．After a short time later， however， we learn what to do and what to say and we learn to enjoy life in another country.
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单项选择题

以下不属于被动投资策略的是( )。

A．局部风险免疫

B．个股选择

C．指数化投资

D．购买并持有
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