光敏二极管是根据压电效应原理制成的。

题型:判断题

问题:

光敏二极管是根据压电效应原理制成的。

考点:测试技术测试技术题库
题型:判断题

生化汤的作用为()

A.补血益气,和营退热

B.养血祛风,疏解表邪

C.养血化瘀,温经止痛

D.清热解毒,凉血化瘀

E.养血健脾,疏肝清热

题型:判断题

The Lake District in north-west England is an area remarkably little affected by industrialization. The principal activity is still sheep-farming, as it has been for a thousand years, and many ancient words like "fell" for "hill" and "tam" for "lake" are still in daily use. In spite of its heavy rainfall and relative inaccessibility, its special atmosphere and spectacular natural beauty combine to make this one of England’s favourite holiday areas at all seasons of the year. But at Christmas 1968, still gripped by the fear that foot-and-mouth disease could spread to the hill flocks and sweep like wildfire right up to the Scottish border, it was quieter than ever before in this century. Luckily not a single farm had caught tile infection, the nearest case having been an isolated one at Kendal several weeks before. But every Lakeland farmer knows that one case among the unfenced hill flocks on the fells could lead to complete annihilation of hundreds of thousands of sheep and the virtual end of the district’s principal industry; you cannot replace sheep, acclimatized to their own part of the fell for generations, in the same way that you can replace cattle in a field.
Nobody could remember a Christmas like it, especially Boxing Dab, which is traditionally one of the big outdoor holidays of the Lakeland year. Normally this is a day spent following the mountain packs of hounds, fell-walking and, if the weather is propitious, skiing and skating, but this time there were none of these things. Visitors were actively discouraged, and those who did come were asked not to go on the fells, footpaths or bridleways or near farmland, while motorists were requested not to drive on minor roads and to shun the smaller valleys. The enterprising hotels which had earlier in the year decided to keep open during the winter were by the end of October having a desperate time. Hundreds of bookings had been cancelled and scores of dinner parties and young farmers’ reunions eliminated. All youth hostels were closed. At least one climbing club, unable to climb, substituted a training programme of films and simulated climbs on the more substantial municipal buildings.
The weather in the area was dry, crisp, windless and cold, in fact ideal for brisk outdoor activities. But nobody was able to enjoy it. Everything was stopped: hunting, walking, climbing, skiing, motor cycle trials, sporting events of every description. All the seasonal dances, festivals, conferences, shepherds’ meets and a hundred and one, other social occasions abandoned. The ice was bearing on some of the lakes but you could not go skating there. Meanwhile the foxes, emboldened by an unprecedented freedom from harassment, were stalking closer to the farms and the flocks of Christmas turkeys, while the hounds sulked miserably in their kennels.
Farmers are apt to criticize some sections of the outdoor fraternity for their occasional thoughtless behaviour, but the way that walkers, climbers, skiers, fishermen, hunters and the rest went out of their way to help them at this time should never be forgotten. The general public, locals and visitors alike, tried to give the fell farmers a sporting chance, and this remarkable display of public spirit was the one bright note in a very sad time.

According to the passage, which of the following statements is NOT true during Christmas time in 1968

A.(A) The seasonal dances, festivals and other social occasions were abandoned.

B.(B) The weather in the Lake District was ideal for brisk outdoor activities.

C.(C) The foxes were stalking closer to the farms and the flocks of turkeys.

D.(D) The ice was bearing on some of the lakes in the district.

题型:判断题

与腐蚀介质接触的奥氏体,应首先焊接,以便其缓慢冷却,细化晶粒,提高抗腐蚀性。()

题型:判断题

某孕妇,停经3个月,子宫大于妊娠月份,鉴别正常妊娠、多胎妊娠、异位妊娠的最好方法是

A.腹部X线摄片
B.B超检查
C.超声多普勒检查
D.胎儿心电图检查
E.羊水甲胎蛋白测定

题型:判断题

使用冰箱保存冷菜时,()必须严格分开,以防交叉污染。

A、无卤汁菜品之间;

B、有卤汁菜品之间;

C、成品与成品;

D、成品与半成品

更多题库