A single vertical magnet placed underneath the compass in the binnacle is used to compensa

____.

A.two balls in a vertical line

B.two diamonds in a vertical line

C.a single black ball

D.no shape is shown during the day

A.双垂尾 double vertical tail

B.单垂尾+腹鳍 single vertical tail + ventral fins

C.飞翼式 flying wing

D.无尾 tailless

A.双垂尾 double vertical tail

B.飞翼式 flying wing

C.单垂尾+腹鳍 single vertical tail + ventral fins

D.无尾 tailless

Which compensates for errors introduced when the vessel heels over ________．

A.The soft iron spheres on the arms of the binnacle

B.Magnets placed in trays inside the binnacle

C.A single vertical magnet beneath the compass

D.The Flinders bar

A.理想的热机是造得出来的，从单一热源吸热使之全部做功，这样的热机造得出来的； The ideal engine can be made by absorbing heat from a single heat source and doing all the work;#B.理想的热机是造不出来的，从单一热源吸热使之全部做功，而不引起其他的变化，这样的热机造不出来的； The ideal heat engine is made not to come out, make it all work is done from a single heat source, absorption of heat, without causing other changes, such as engine which cannot be made;#C.理想的冷机是造不出来的，热量自动地从高温物体传向低温物体，这样的冷机造不出来的； The ideal cold ma

s they took advantage of discounts offered on Singles Day (November 11). It is a festival for young single people to celebrate by eating together, sending gifts or going shopping, thus seized on by online retailers to increase sales. It took only 13 hours for sales on just two online sites, Taobao and Tmall, to fly past last year's overall total of 19.1 billion yuan (US$3.1 billion).The final figure of Singles Day reached an astonishing 35.02 billion yuan as hundreds of thousands of consumers rushed to buy clothes, furniture, and home decoration items at discount prices. What friends and colleagues greeted each other with that day was “Bought anything today？” as they exchanged tales of bargains or disappointing news of popular items sold out minutes after the spree began at midnight. In under nine hours, turnover at the Alibaba Group's Tmall and Taobao sites had exceeded that of last year's Cyber Monday, a similar event in the United States. “We hope other e-commerce sites also did a good job as we want Singles Day to be a holiday for consumers and a good chance for retailers to discover the unmet needs of shoppers,” Jack Ma, founder and chairman of Alibaba Group, told reporters. “It's not a difficult thing to bring our total transaction size to 100 billion yuan in a couple of years but we hope to do more to help vendors and manufacturers to upgrade their products and service to reach more clients,” Ma said at a news briefing.

1. Online retailers took hold of the shopping spree to increase sales successfully.() 2. The final figure of Singles Day for this year reached 19.1 billion yuan.()

3. Cyber Monday is a similar event in the Great Britain.()

4. Other e-commerce sites did as well as Alibaba Group on Singles Day.()

5. Jack Ma's goal of transaction size is to reach 100 billion yuan in several years.()

goods. This is now also true of the building industry; for mechanization has been introduced. System building can save both time and money. The principle of system building is that the building is made from a set of standard units. These are either made at the building-site or at a factory. Some designers, in fact, are standardizing the dimensions of rooms. They are made in multiples of a single fixed length, usually ten centimeters. This is called a modular (标准件的) system, and it means that manufactures can produce standardized fittings at a lower cost. The most important fact about system building is its speed. A ten-storey flat, for example, can be completed in four months. There are several new methods of system building. One is the panel method. In this case, the construction company sometimes erects a factory on the site. The walls and floors of the building, called panels, are cast in a horizontal or vertical position. Conduits for electrical wires and sleeves for pipes are cast in the panels when they are being made. The moulds for making these castings are situated all around the building. After the concrete panels are cast, they are allowed to set and harden for a week. Next they are lifted by a tower crane on to any section of the building. There the panels are cemented together at their joints and the floor covering is laid. After the panels have been cemented together, the crane lifts a case into the area. It contains all the fittings to be installed, such as wash-basins, radiators and pipes. Finishing tradesmen, such as plumbers, plasterers, painters and electricians, follow behind to complete the work. In some building developments, in some countries, whole flats with internal features like their bathrooms, bedrooms and connecting stairs, and weighing as much as twenty tons, are carried to the building-site ready-made. A giant overhead crane is used to lift them into position. In the future, this method may become more widespread. The main difference between panel method and the method discussed in the last paragraph is_______.

A.the latter uses ready-made internal features

B.panels are cast in a level position

C.the former is used to build walls and floors while the latter to construct bathrooms or bedrooms

D.the former is more expensive than the latter

surface.()

A.横向的

B.纵向的

C.垂直的

D.水平的