下列哪一项不属于汞的理化特点（） A.在常温下易蒸发 B.汞蒸气一般停留在车间上层空

目前国际上交易量位居前列的银行卡清算组织包括（）。

A、VISA信用卡组织

B、万事达国际组织

C、JCB信用卡公司

D、大莱信用卡公司

力量练习的基本方法中力求产生最大的动力练习主要目的是（）

A.增进肌肉耐力

B.增强肌肉力量、速度和爆发力

C.提高肌肉的灵敏性和爆发力

D.增进力量练习的效果

患者，女，24岁。患腿痈1周，溃腐3天，脓腐稠厚且多，不易脱落。外用掺药应首选（）。

A.青黛散

B.八二丹

C.红灵丹

D.八宝丹

E.三石散

归脾丸的功能主治为

A．滋阴补肾

B．益气健脾

C．健脾和胃

D．养血安神

E．强筋健骨

In the past year, a lot has changed in the field of human spaceflight. (46)In January, President George Bush brushed aside the fact that America’s entire space-shuttle fleet was grounded when he announced grandiose plans to put people back on the moon, and then to launch a manned mission to Mars. (47) In June, Burt Rutan, an American aeronautical engineer, showed that human spaceflight was no longer the preserve of governments by sending a man to the edge of space in Space Ship One, a privately financed vehicle that cost about the same to build as a luxury yacht. That was followed in September by Sir Richard Branson, the British entrepreneur behind the Virgin brand, announcing that he had signed a deal with Mr. Rutan to work on plans for a fleet of five suborbital vehicles developed from Space Ship One.

(48) Now, in the dying days of the year, America’s Congress has passed a bill that unravels a tangle about who would be responsible for regulating the fledgling industry, and under what terms. (49) The bill also allows passengers to fly, on the understanding that this new generation of vehicles may not be as safe as taking a commercial flight between, say, New York and London.

The official line from Virgin Galactica, as Sir Richard’s latest venture is modestly named, is that this coming change in the law makes no practical difference to the firm’s plans, since they do not intend to fly unless they can make their spacecraft as safe as a private jet. But it must surely come as some sort of relief. In any case, Will Whitehorn, director of corporate affairs at Virgin’s headquarters in London, and soon to become the president of Virgin Galactica, says that work is under way on a mock-up of the interior of a new spacecraft that will hold five passengers. (50) Virgin has already committed $20m towards licensing the SpaceShipOne technology from Mr. Rutan and his financial backer Paul Allen, a software billionaire.

(50) Virgin has already committed $20m towards licensing the SpaceShipOne technology from Mr. Rutan and his financial backer Paul Allen, a software billionaire.