如果钻机的钻杆、卡爪磨损严重,在作业时易出现钻杆()现象。 A.抖动 B.脱落 C.

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问题:

如果钻机的钻杆、卡爪磨损严重,在作业时易出现钻杆()现象。

A.抖动

B.脱落

C.损坏

考点:安全仪器监测工初级安全仪器监测工初级安全仪器监测工题库
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叶某,女,44岁。有风湿性心脏病,心力衰竭病史。平素受凉感冒后易发生咳嗽、呼吸困难、乏力症状,自服“螺内酯、卡托普利、地高辛、美托洛尔”等药物治疗。

若病人呼吸困难突然加重,烦躁,咳嗽,咳粉红色泡沫痰,面色苍白,皮肤冷汗。应考虑病人发生了()

A.心律失常

B.心源性休克

C.急性左心衰竭

D.呼吸衰竭

E.肺部感染

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.I’d like to have a word ______ Tony.   [ ]

A. on              

B. with            

C. in

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简述资料的整理与分析中数据描述的三种量数及其含义。

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Nine states and the District of Columbia are doing away with the sales tax on items such as clothes, shoes and even notebooks over the next few weeks, just in time for back-to- school shopping.
Most of the promotions last only a few days, so shoppers will have to act quickly to get a tax break. The tax holidays, which have already expired in two other states, apply to small and large items. For example, the tax break applies to any school supply that costs $15 or less in New Mexico. In Massachusetts, it covers most retail purchases of $2,500 or less. Stores may offer additional savings because these events "give retailers an opportunity to have a sale on top of what the state is doing," says Verenda Smith, government affairs associate at the Federation of Tax Administrators.
No industry-wide figures are available about how much consumers save annually from these tax breaks. But Texas estimates that shoppers will save $47.4 million in taxes this year, nearly a 3 percent increase from the previous year. Massachusetts says shoppers saved roughly $10 million in taxes during its 2005 event.
States that cast aside these promotions when a slow economy pinched state budgets are now reviving them in hopes of stimulating local economies. Some states also believe the gain in consumer goodwill helps balance out the loss in tax revenue.
In some cases, tax losses are minimal because serious shoppers don’t stop at clothes and books. "While states give up sales tax, they usually break even on sales-tax collection," says J. Craig Shearman, a vice-president at the National Retail Federation.
Sophie Beckmann, a certified public accountant at A. G. Edwards in St. Louis, says she’ll avoid that temptation by making a list of necessities. On the Missouri resident’s shopping list: notebooks, pencils, glue and three or four outfits for her son, who is entering the fifth grade this month. She plans to pocket any tax savings. "When you start buying more and spending more just because of the savings, then you’re not doing yourself a favor," Beckmann says.

According to the passage, residents in the state of Mississippi saved last year from tax breaks about ______ .

A.$10 million

B.$47.4 million

C.no statistics available

D.nearly a 3 percent increase

题型:单项选择题

尘肺病案例分析中的要点

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