一对夫妇生第一胎是男孩,这对夫妇打算生第二胎,第二胎是男孩的比率是( ) A.0

题型:选择题

问题:

一对夫妇生第一胎是男孩,这对夫妇打算生第二胎,第二胎是男孩的比率是(  )

A.0

B.100%

C.50%

D.75%

考点:人的性别遗传
题型:选择题

小虎用一只水银的温度计,测量烧杯中水的温度,如图所示.

请指出他在使用温度计时存在的两个问题:

①______;

②______.

题型:选择题

腮腺囊肿的声像图特征是()。

A.形态不规整,轮廓边界清晰,多呈多边形或锯齿状

B.边界完整,内为无回声,后方回声增强

C.内呈不均质混合回声

D.透声不清亮,后方轻度衰减

题型:选择题

银行并表监管包括的业务有()。

A.境内外业务

B.表内外业务

C.本外币业务

D.证券发行业务

E.证券经纪业务

题型:选择题

Fate has not been kind to the western grey whale. Its numbers have dwindled to 130 or so, leaving it “critically endangered” in the eyes of the International Union for the Conservation of Nature. Fishing-nets, speeding ships, pollution and coastal development threaten the few that remain. Most recently, drilling for oil and gas in their main summer feeding grounds, near Sakhalin island off Russia’s Pacific coast, has brought fresh risks for the luckless creatures. Yet the rush to develop Sakhalin’s offshore fields may yet be the saviour of the species.

When drilling was first discussed in the 1990s, there were muted complaints. When a consortium called Sakhalin. Energy, led by Royal Dutch Shell, announced plans to build an oil platform and lay pipelines in the only bay where the whales were known to congregate, these protests proliferated.

In response, the consortium established an independent panel to advise it on how best to protect the whales and promised to fund its work. It subsequently agreed to change the route of the pipeline at the panel’s suggestion, although it refused to move the platform, as other critics had demanded. It also agreed either to follow the panel’s recommendations in future or to explain publicly why it was rejecting them.

The platforms and pipelines are now complete. Sakhalin Energy exported its first cargo of liquefied natural gas last week. The project, says Shell, is an engineering triumph and a commercial success despite all the controversy.

But has it been a success for the whales Sakhalin Energy says their number seems to be growing by 2.5% a year, although Ian Craig, the firm’s boss, admits that the cause might be greater scrutiny rather than population growth. The scientists on the panel still seem worried. They complain that the firm has not always provided the information they need to assess the threat to the whales. It also has not always followed advice, the scientists’ advice about how noisy construction might scare the animals away, for example, or the speed that boats should travel to minimize the risk of hitting the whales. The scientists warn that the loss of just a few fertile females would be enough to tip the population into irrevocable decline. Last summer, there seemed to be far fewer whales around than normal.

On the other hand, the panel knows this only because Sakhalin Energy funds lots of research on the whales. As a result, it has discovered that they have a wider range than originally thought, which might explain why so few of them showed up off Sakhalin island last year.

Therefore, it is hard to escape the conclusion that, for creatures with a lot as sorry as the western grey whale, a nearby oil project is something of a blessing.

To ease the protest against its projects, Sakhalin Energy()

A. moved its platform from the bay where the whales congregate

B. established a panel to be in charge of its public relationship

C. rejected its program near Sakhalin’s offshore

D. organized some experts to study and protect the whales

题型:选择题

计算题:计算出45钢室温下的铁素体与球光体含量比例。(三次渗碳体忽略不计)

更多题库