在“描绘小灯泡的伏安特性曲线”实验中，电路图如图（a）所示，所用器材有：小灯泡（

下列工程施工中所使用的材料，必须实施见证取样和送检的是（）。

A.所有商品混凝土试块

B.地下、屋面、厕浴间使用的防水材料

C.拌制砌筑砂浆的水泥

D.抹灰的配料水泥

E.承重结构的钢筋及连接接头试件

Whenever we could, Joan and I took refuge in the streets of Gibraltar. The Englishman’s home is his castle because he has not much choice. There is nowhere to sit in the streets of England, not even, after twilight, in the public gardens. The climate, very often, does not even permit him to walk outside. Naturally, he stays indoors and creates a cocoon of comfort. That was the way we lived in Leeds.

These southern people, on the other hand, look outwards. The Gibraltarian home is, typically, a small and crowded apartment up several flights of dark and dirty stairs. In it, one, two or even three old people share a few ill-lit rooms with the young family. Once he has eaten, changed his clothes, embraced his wife, kissed his children and his parents, there is nothing to keep the southern man at home. He hurries out, taking even his breakfast coffee at his local bar. He comes home late for his afternoon meal after an appetitive hour at his ear6. He sleeps for an hour, dresses, goes out again and stays out until late at night. His wife does not miss him, for she is out, too — at the market in the morning and in the afternoon sitting with other mothers, baby-minding in the sun.

The usual Gibraltarian home has no sitting-room, living-room or lounge. The parlour of our working-class houses would be an intolerable waste of space. Easy-chairs, sofas and such-like furniture are unknown. There are no bookshelves, because there are no books. Talking and drinking, as well as eating, are done on hard chairs round the dining-table, between a sideboard decorated with the best glasses and an inevitable display cabinet full of family treasures, photographs and souvenirs. The elaborate chandelier over this table proclaims it as the hub of the household and of the family. "Hearth and home" makes very little sense in Gibraltar. One’s home is one’s town or village, and one’s hearth is the sunshine.

Our northern towns are dormitories with cubicles, by comparison. When we congregate — in the churches it used to be, now in the cinema, say, impersonally, or at public meetings, formally — we are scarcely ever man to man. Only in our pubs can you find the truly gregarious and communal spirit surviving, and in England even the pubs are divided along class lines.

Along this Mediterranean coast, home is only a refuge and a retreat. The people live together in the open air — in the street, market-place. Down here, there is a far per feeling of community than we had ever known. In crowded and circumscribed Gibraltar, with its complicated inter-marriages, its identity of interests, its surviving sense of siege, one can see and feel an integrated society.

To live in a tiny town with all the organization of a state, with Viceroy (总督), Premier, Parliament, Press and Pentagon, all in miniature, all within arm’s reach, is an intensive course in civics. In such an environment, nothing can be hidden, for better or for worse. One’s successes are seen and recognized; one’s failures are immediately exposed. Social consciousness is at its pest, with the result that there is a constant and firm pressure towards good social behaviour, towards courtesy and kindness. Gibraltar, with all its faults, is the friendliest and most tolerant of places. Straight from the cynical anonymity of a big city, we luxuriated in its happy personalism. We look back on it, like all its exiled sons and daughters, with true affection.

There is a much per sense of () among the Gibraltarians.

A. togetherness

B. survival

C. identity

D. leisure

下列说法正确的是（　　）

A．本饮料中绝对不含化学物质

B．水与油可以互变

C．没有水就没有生命

D．气功可以使铝变成金

为什么升流器的二次绕组需采取抽头切换方式？