采用双管状接地极时，每根管长度不得小于（），两根管垂直埋设，间距不小于（）。

实现有效气体交换的通气量为（）

A.有效肺活量

B.时间肺活量

C.肺总量

D.肺通气量

E.肺泡通气量

下列哪项不属于教学目标设计？（）

A.教学对象分析

B.教学内容分析

C.教学与学法的设计

D.教学目标的编制

The day was star-crossed: Friday the 13th in the month of October, on the eve of the second looming anniversary of a devastating market crash. "I’m telling you, psychology is really funny. People get crazy in situations like that," said portfolio strategist Elaine Garzarelli. Last week Friday the 13th lived up to its frightful reputation. After drifting lower at a sleepy pace for most of the day, the Dow Jones industrial average abruptly lurched into a hair-raising sky dive in the final hour of trading.

The Bush Administration moved swiftly to avert any sense of crisis after the market closed. Declared Treasury Secretary Nicholas Brady: "It’s important to recognize that today’s stock market decline doesn’t signal any fundamental change in the condition of the economy. The economy remains well balanced, and the outlook is for continued moderate growth." But Massachusetts Democrat Edward Markey, who chairs a House subcommittee on telecommunications and finance, vowed to hold hearings this week on the stock market slide. Said he: "This is the second heart attack. My hope is that before we have the inevitable third heart attack, we pay attention to these problems."

Experts found no shortage of culprits to blame for the latest shipwreck. A series of downbeat realizations converged on Friday, ranging from signs of a new burst of inflation to sagging corporate profits to troubles in the junk-bond market that has fueled major takeovers. The singular event that shook investors was the faltering of a $6.75 billion labor management buyout of UAL, the parent company of United Airlines, the second largest U. S. carrier.

On one point most thoughtful Wall Streeters agreed: the market had reached such dizzying heights that a correction of some sort seemed almost inevitable. Propelled by favorable economic news and a wave of multibillion-dollar takeovers, stocks had soared more than 1,000 points since the 1987 crash. But by last August some Wall streeters were clearly worried.

The heaviest blow to the market came Friday afternoon. In a three-paragraph statement, UAL said a labor-management group headed by Chairman Stephen Wolf had failed to get enough financing to acquire United. Several banks had apparently balked at the deal, which was to be partly financed through junk bonds. The take-over group said it would submit a revised bid "in the near term,’ but the announcement stunned investors who had come to view the United deal as the latest sure thing in the 1980s buyout binge. Said John Downey, a trader at the Chicago Board Options Exchange: "The airline stocks have looked like attractive takeover targets. But with the United deal in trouble, everyone started to wonder what other deals might not go through.

The main reason for the latest crisis in stock market as pointed out by the writer lies in（）

A. the perception of inflation

B.the collapse of confidence

C. the failure of a buyout deal

D. the correction of a market

方女士，30岁，停经3个月，无不适。妇科检查：子宫3个月妊娠大小，其左上方有一质硬肿块，约5×4×3cm大小。B型超声检查提示：宫内妊娠合并子宫肌瘤。妊娠期子宫肌瘤最易发生哪种变性

A．玻璃样变性

B．囊性变

C．肉瘤样变

D．红色变性

E．黏液样变性

下列关于当日收款确认的说法中，正确的是（）

A、出单中心（含出单分中心）应按照日清日结的要求每日下班前核对收款数据无误后完成当日收款确认操作。特殊情况下确认周期可以适当延长，收付费系统中当日收款确认最长周期不应超过15日。

B、出单中心（含出单分中心）当日收款确认操作采取出单分中心和出单中心两级确认模式。

C、出单分中心综合岗对本出单分中心收款情况核对无误后完成出单分中心当日收款确认，确认后提交出单中心审核。

D、出单中心综合岗对所辖各出单分中心及出单中心本级的收款情况核对无误后完成出单中心当日收款确认。