二甲基亚砜(DMSO)是一种氢键破坏剂。在生化分子生物实验中常用于变性凝胶电泳等,它

题型:单项选择题

问题:

二甲基亚砜(DMSO)是一种氢键破坏剂。在生化分子生物实验中常用于变性凝胶电泳等,它()

A、无色无味的液体;

B、易溶于有机溶剂,不溶于水;

C、沾到皮肤上之后,无需用大量的水洗以及稀氨水洗涤;

D、存在一定的毒性作用,与蛋白质疏水集团发生作用,导致蛋白质变性,具有血管毒性和肝肾毒性。

考点:生物安全生物安全题库
题型:单项选择题

新生儿用药避免药物过量中毒的用药剂量通常()。

A.给予1/4成人剂量

B.给予1/2成人剂量

C.按体重计算剂量

D.按日龄计算剂量

题型:单项选择题

中国人民解放战争,是中国人民在中 * * 党的领导下,为建立人民民主 * * 而进行的一次伟大革命战争。这场战争历时近4年,人民解放军共歼灭国民党军807万余人,解放了除西藏及台、澎、金、马、西沙、南沙等少数岛屿以外的全部国土。这场战争,是世界战争史上的奇迹。

题型:单项选择题


Passage One

Go Ahead—Cook with It
别怕—就用它来烹饪
It’s grapefruit season. From now through March, the golden orbs are ripe for the picking. And they’re not just for breakfast any more.
Hanging around on trees all about California: grapefruit—heavy with juice, tartly sweet, beguilingly perfumed.Round and yellow as happy faces or suns, they seem to ripe just as the general populace sinks into its annual round of post-holiday dietary self-chastisement.
Coincidence Perhaps. But we say run with it.
Look beyond the obvious salvo of half a grapefruit for breakfast attacked with a jagged spoon and you’ll find a marvelous fruit for peeling and eating out of hanD.There’s nothing like it for inducing simultaneous feelings of gastronomic piety and delight at recapturing a long-lost pleasure. It’s sensual: the aroma of essential oils as they spurt daintily from the pores of the thick skin, the ripping sound of the tenacious segments being pulled apart, the juice dripping down. And it’s delicious.
But don’t stop there. Cook with grapefruit. Use its juice to flavor sauces. Section and scatter it. Bake with it. Candy its peel. Grapefruit is milder and sweeter than lemon, but it can be used in many of the same ways—squeezed on grilled fish, made into a brightly flavored curD.And if you’re looking for gorgeous color, red grapefruit offers extra plate appeal.
The notion that red grapefruit is sweeter than white or yellow grapefruit is, however, a myth, according to citrus specialists. (The story grew out of a marketing campaign by Texas growers. ) Red grapefruits get their color from lycopene, which has health benefits (its an antioxidant)but does not affect flavor.
Sweetness is determined, rather, by the length of time the fruit has been hanging on a tree. A grapefruit picked in December isn’t as sweet as one picked in February, so if you have a tree, just pick fruit as needed.
If not, ask at your farmers market about the different varieties available, all of which have their fans. California reds include the medium-pink Rio Reds from the Caochella Valley and the Star Ruby from Central Valley (and Texas). Yellow Marsh is a familiar yellow variety and the Duncan, while not usually labeled as such in supermarkets, is a reliable white.
For those who don’t like the tartness of a true grapefruit, Oro Blanco—the half-grapefruit, half-acidless pummelo—is sweeter and can be used in salads.
Our salad of jicama strips, thinly sliced snow peas, fresh pea sprouts (available in Asian markets)and red grapefruit sections has an appealing crunch. Its delicately harmonious flavors are pulled together with a faintly sweet dressing of grapefruit juice, tarragon and mint.
The strikingly pink sauce of our baked halibut dish contrasts with the white flesh of the fish for an artful plate—and it’s easy to make. Before baking, marinate the halibut in grapefruit juice with garlic and thyme. Sauce it with a reduction of grapefruit juice combined with blood orange juice, which deepens the color and softens the flavor. Then whisk in bits of cold butter for silkiness.
A rich crust is a perfect foil for the tangy grapefruit curd filling in our pretty tartlets. Both grapefruit juice and lemon juice are used in the curd to focus the flavor; grapefruits zest enlivens the crust. Garnish them with whipped cream and candied grapefruit peel.
For cooking, select heavy fruit, which indicates juiciness. (If you’re making a batch of candied peel, however, lighter fruit will indicate more peel.) Before juicing, roll a grapefruit under your hand on the countertop to help extract the most juice. Avoid lumpy fruit, which may be over-ripe.
And finally, for those whose resolute January superegos care about such things, here’s a reassuring thought: Grapefruit is low in calories (40 to 60 each), high in vitamins C and A, and an excellent source of fiber. It contains no fat, sodium or cholesterol.
So peel away.

The sweetness of the grapefruit is determined by______.

A.lycopene

B.the length of time the fruit is exposed to the sun

C.the length of time the fruit is hanging on a tree

D.the specific nutrient the fruit takes from the soil

题型:单项选择题

焊机的接地电阻可用打人地里深度不小于1m、电阻不大于()Q的铜棒或铜管做接地板。

A、l

B、4

C、10

D、20

题型:单项选择题

下列各项中,属于社会审计特有的程序是()。

A.签订审计业务约定书

B.进行内部控制测试

C.进行实质性测试

D.确定重要性水平

更多题库