骨髓增生明显活跃时,成熟红细胞与有核细胞的比值是() A.1:1 B.10:1 C.

题型:单项选择题 B1型题

问题:

骨髓增生明显活跃时,成熟红细胞与有核细胞的比值是()

A.1:1

B.10:1

C.20:1

D.50:1

E.200:1

考点:中医执业医师第一阶段实验室诊断实验室诊断题库
题型:单项选择题 B1型题

影响金-瓷结合的重要因素是 ()

A.金属表面未除净的包埋料

B.合金基质内有气泡

C.金-瓷冠除气预气化方法不正确

D.金属基底冠过厚

E.修复体包埋料强度的大小

题型:单项选择题 B1型题

以下各项不属于信用证基本当事人的是:

A.开证申请人

B.开证行

C.保兑行

D.信用证受益人

题型:单项选择题 B1型题

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.

(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.

题型:单项选择题 B1型题

下列不属于自然灾害的是()

A、地震灾害

B、气象灾害

C、环境污染事件

D、森林草原火灾

题型:单项选择题 B1型题

陶瓷贴花纸按印刷方法的不同可分为().

A.平版印刷贴花纸

B.平板印刷贴花纸和丝网版印刷贴花纸

C.平版印刷贴花纸、丝网版印刷贴花纸和凹版印刷贴花纸

D.平版印刷贴花纸和凹版印刷贴花纸

更多题库