炒苋菜时汤会变红,红色物质主要来自于细胞的 [ ] A.细胞膜 B.细胞壁 C.

题型:选择题

问题:

炒苋菜时汤会变红,红色物质主要来自于细胞的 [ ]

A.细胞膜

B.细胞壁

C.液泡

D.细胞核

考点:植物细胞结构和功能
题型:选择题

在验证机械能守恒定律的实验中,质量为m的重锤拖着纸带下落,在此过程中,打点计时器在纸带上打出一系列的点.在纸带上选取五个相邻计数点A、B、C、D和E,相邻计数点时间间隔为T,如图所示.其中0为重锤开始下落时记录的点,各计数点之间的距离如图7所示,当地重力加速度g.

(1)打点计时器打下计数点B时,重锤下落的速度vB=______,打点计时器打下计数点D时,重锤下落的速度vD=______.

(2)从打下计数点B到打下计数点D的过程中,重锤重力势能减小量△EP=______,重锤动能增加量△EK=______.

(3)在误差允许范围内,通过比较______就可以验证重锤下落过程中机械能守恒了.

题型:选择题

新出现的、与空调有关的医院感染病原体是()

A.粘质沙雷菌

B.聚团肠杆菌

C.洋葱假单胞杆菌

D.嗜肺军团菌

E.阴沟杆菌

题型:选择题

单位卡内账户资金一律从其开户网点基本存款账户转账存入,不得存取现金,不得将销货收入存入单位卡账户。单位卡可办理()以下商品交易和劳务供应款项的结算。

A、10万元(含10万元)

B、20万元(含20万元)

C、50万元(含50万元)

题型:选择题

Texans have bursting pride and love attention. They also have a thick streak of shortsighted greed and, even by American standards, a busted disposition to violence. When they hear this sort of criticism they usually ascribe it to the ignorance and jealousy of stuffy Yankees who have not spent enough time in the state to understand it. For such avowedly robust people they are surprisingly sensitive. They hated Edna Ferber’’s novel Giant, which scourged Texan vulgarity, racism and the mores of millionaires, but they bought it in great quantities and packed cinemas to see the film. They would rather be talked about than not, and if you do not talk about them they do it for you.In claiming special qualities for themselves, Texans have had to become reconciled to the fact that a large number of them are not native. In the last century "Gone to Texas" was a commonplace graffito daubed on barns in other states, and in recent years "Gone to Texas" has, figuratively, been written on the front doors of millions of Americans and also Mexicans. In the early 1980s newcomers accounted for nearly two-thirds of the state’’s population increase. But Texans do not believe they are being diluted. They maintain that Texanhood, or Texianism, is a matter of attitude and that Texanic qualities exist in abundance in many Americans, regardless of their birthplace: it is when these people are planted in Texas, and nourished by its atmosphere, that they flower like true Texans. A man may not be born in Texas, which is unfortunate; but he can be born to be Texan.Many Alaskans are urban, young and raising families, here for a while, and trying to make money before moving to somewhere warmer. But many are staying. While most remain in Anchorage and other centers, some set out to build a cabin in the wilderness and live by hunting, trapping and fishing, learning how to skin a muskrat and moose, how to survive terrible weather, how to be truly in tune with the land, taking pleasure in great silence and unpeopled immensity. To settle the frontier the state has a homesteading program, based on the federal Homestead Act of 1864, which was a key event in the opening up of the American west. Hundreds of Alaskans are awarded parcels of wilderness land in an annual lottery and undertake to invest sweat equity, to build a home within three years and clear and cultivate the land within five. Alaskans love reading about Alaska, and two of the most popular books are a manual on log cabin building and a collection of tales about grizzly bears, of which Alaska is a phold. Log cabin life is for the stout-hearted few with the springs of adventure p in them, and these wilderness Alaskans are remarkable. Some are refugees of one kind or another. Several hundred are Vietnam veterans, tortured by their experiences of war and unable to fit into normal urban life, seeking solace in the wilds.

Which of the following statements can best describe Texans

A.They are aggressively self-confident of their wisdom.

B.They are brutally crude in making a living for themselves.

C.They are blindly allergic to negative comments on their weakness.

D.They are openly and crudely thin-skinned about discriminations against them.

题型:选择题

在城市房屋拆迁估价中,被拆迁房屋的房地产市场价格与被拆迁房屋的性质和面积直接相关。( )

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