()接口牢固耐久,不易渗漏,接头强度和严密性高,使用后不需要经常管理。A.螺纹连接

题型:单项选择题

问题:

()接口牢固耐久,不易渗漏,接头强度和严密性高,使用后不需要经常管理。

A.螺纹连接 

B.焊接连接 

C.法兰连接 

D.承插连接

考点:一级消防工程师一级消防工程师综合练习一级消防工程师综合练习题库
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柜员日终需进行的核对包括()。

A.现金核对

B.核对重要空白凭证

C.核对有价单证

D.清点印章

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某企业6月1日甲原材料结存300件,单价2元,6月5日发出100件,6月7日购进200件,单价2.2元,6月15日发出200件。企业采用移动加权平均法计算发出存货成本,则在6月15日结存的原材料成本为()元。

A.400

B.416

C.420

D.440

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膈膨升( )

A.腹部脏器自胸腹裂孔缺损疝入胸腔
B.腹部脏器自胸骨旁缺损疝入胸腔
C.腹部闭合性损伤,腹腔脏器经膈肌破裂处疝入胸腔
D.贲门和胃底经膈食管裂孔疝入纵隔
E.膈肌发育薄弱,腹腔脏器向胸腔膨出

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努尔哈赤时期统一了内蒙古。

题型:单项选择题

The central problem of economics is to satisfy the people’s and nation’s wants. The problem we are faced with is that our (1) , here identified as money, are (2) . The only way we can resolve our (3) is to make choices. After looking at our resources, we must examine our list of (4) and identify the things we need (5) , those we can postpone, and (6) we cannot afford. As individuals, we face the central problem involved in economics — deciding just how to allocate our limited resources to provide ourselves with the greatest (7) of our wants.
Nations face the same problem. As a country’s population (8) , the need for more goods and services grows (9) . Resources necessary to production may increase, but there are (10) enough resources to satisfy the total desires of a (11) . Whether the budget meeting is taking place in the family living-room, in the conference room of the corporation (12) of directors, or in the chamber of the House of Representatives in Washington, the basic problem still exists. We need to find (13) of allocating limited resources in order to satisfy unlimited wants.
A short time ago, economists divided goods into two categories, free and economic. The former, like air and water, were in (14) abundance that economists had no concern about (15) of scarcity and what to do about it. Today many of these "free goods" are in (16) very expensive to use. Pollution has made clean air and water expensive for producers who have to filter their waste products, for consumers who ultimately pay for the producers’ extra costs, and (17) tax-payers who pay for the government’s involvement in cleaning the environment.
In the 1990s, almost all goods are (18) . Only by effort and money can they be (19) in the form people wish.
Meeting the needs of people and the demands from resources available leads to the basic activity of production. In trying to (20) unlimited wants from limited economic goods, production leads to new problems in economics.

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