测定氟化物的水样,必须用()(材质)容器采集和存贮。

题型:填空题

问题:

测定氟化物的水样,必须用()(材质)容器采集和存贮。

考点:环境监测上岗考试氟化物氟化物题库
题型:填空题

已知x,y∈R,则“x•y=0”是“x=0”的(  )

A.充分不必要条件

B.必要不充分条件

C.充要条件

D.既不充分也不必要条件

题型:填空题

上海证券交易所规定,连续竞价期间未成交的买卖申报,自动进入收盘集合竞价。()

题型:填空题

下列关于投资性房地产的后续计量说法中,正确的是( )。

A.投资性房地产的计量模式有成本模式和公允价值模式

B.企业通常采用成本模式计量,但满足特定条件的可采用公允价值模式

C.企业可采用成本模式,同时也可以采用公允价值模式

D.计量模式一经确定,一律不得变更

题型:填空题

接力器的运动速度能在一定范围内调整的目的是为了满足()的要求。

A.调保计算;

B.增减负荷;

C.无差调节;

D.以上都不正确。

题型:填空题

The history of African—Americans during the past 400 years is traditionally narrated (1) an ongoing struggle against (2) and indifference on the part of the American mainstream, and a struggle (3) as an upward movement is (4) toward ever more justice and opportunity.

Technology in and of (5) is not at fault; it’s much too simple to say that gunpowder or agricultural machinery or fiber optics (6) been the enemy of an (7) group of people. A certain machine is put (8) work in a certain way—the purpose (9) which it was designed. The people who design the machines are not intent on unleashing chaos; they are usually trying to (10) a task more quickly, cleanly, or cheaply, (11) the imperative of innovation and efficiency that has ruled Western civilization (12) the Renaissance.

Mastery of technology is second only (13) money as the true measure of accomplishment in this country, and it is very likely that by (14) this under-representation in the technological realm, and by not questioning and examining the folkways that have (15) it, blacks are allowing. (16) to be kept out of the mainstream once again. This time, however, they will be (17) from the greatest cash engine of the twenty-first century. Inner-city blacks in particular are in danger, and the beautiful suburbs (18) ring the decay of Hartford, shed the past and learn to exist without contemplating or encountering the tragedy of the inner city.

And blacks must change as well. The ways that (19) their ancestors through captivity and coming to freedom have begun to loose their utility. If blacks (20) to survive as full participants in this society, they have to understand what works now.

14()

A.totolerate

B.tolerate

C.tolerated

D.tolerating

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