159. Top and bottom inner graduated borderlines of the chart are___

A . tank top B . compartment between the tank top and shell of the vessel C . inner side of the vessel's shell D . space between two transverse bottom frange

A . chartplotter B . C-MAP NT C . C-Cards D . PPI

A . scales of latitude B . scales of longitude C . compass rose D . source data

A . floors B . intercostals C . stringers D . tank top support

A . the running-in period B . the running process C . gas exchange process D . the boiler firing

A . Top-down策略是对完整蛋白质直接进行分析鉴定的自上而下的策略 B . Bottom-up策略以蛋白质酶解后的太大为分析对象的自下而上的研究策略 C . Top-down策略不适宜用于对蛋白质翻译后修饰的表征 D . Bottom-up策略不适宜用于对蛋白质翻译后修饰的表征

A . the use of rowid B . a GROUP BY clause C . an ORDER BY clause D . only an inline view E . an inline view and an outer query

A . forcastle B . tweendeck C . hatches D . peak tank

A . still water level B . wave crest C . wave crest plus the charted water depth and tidal corrections D . wave crest plus the charted water depth and tidal correction and storm surge

A . vessel trolling B . mineclearing vessel C . trawler D . vessel engaged in replenishment at sea

A . Member variables of the outer instance are always accessible to inner instances， regardless of their  accessibility modifiers. B . Member variables of the outer instance can never be referred to using only the variable name within  the inner instance. C . More than one inner instance can be associated with the same outer instance. D . All variables from the outer instance that should be accessible in the inner instance must be declared  final. E . A class that is declared final cannot have any inner classes.

According to Dr. Scorer, Benjamin Franklin first proved thunderclouds are charged with electricity. Later investigation showed that the tops of the clouds have a great positive charge and the bottoms a great negative charge. When the charges become great enough to break down the insulating properties of the air, lightening flashes carry the electricity within the cloud, or from cloud to cloud, or from cloud to earth. But the question remained: how do the charges develop within the cloud？ To seek the cause, Dr. Scorer and his colleagues at the college first duplicated thundercloud currents in a liquid tank. They doubt that mixture takes place only in the tops of the clouds. Next a study of thunderclouds over the North Atlantic showed that lightening occurs only when the air temperature around the cloud is below freezing. Particles at the top of the cloud begin to freeze, but those in the remainder of the cloud stay unfrozen although below freezing temperature. To measure moisture, the scientists sent planes equipped with external refrigerated rods into the clouds. The idea was that moisture would freeze on the rods and could later be measured. The men found, however, that some of the moisture particles bounced off the rods. This accidental discovery set the scientists on a new course of action. In the laboratory, S. E. Reynolds whirled a refrigerated rod through ice particles and found that the particles bounced off the rod acquired a positive charge. This was the missing link. Without hail and super-cooled clouds, he concluded there could be no lightening. According to the article, Benjamin Franklin was the first to prove that _______. A．lightening is caused by hail falling through super - cooled clouds B．thunderclouds are not charged with electricity C．thunderclouds are charged with electricity D．lightening was not an invention of the devil

26、如果<img style="border-bottom-color: rgb（0, 0, 0); border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: rgb（0, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb（0, 0, 0); border-right-style: none; border-right-width: 0px; border-top-color: rgb（0, 0, 0); border-top-style A．电路总有功功率与电路总无功功率取值相同 B．电路总有功功率与电路总视在功率取值相同 C．电路总无功功率与电路总视在功率取值相同 D．发生在电容和电感元件上的无功功率均为0

A．50% B．85% C．30% D．40%

已知函数<img style="border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-width: 0px; border-top-color: currentColor; border-top-style: A．第一个存在，第二个不存在 B．都存在 C．都不存在 D．第一个不存在，第二个存在

6、已知<img style="border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-width: 0px; border-top-color: currentColor; border-top-style: A．0 B．0.1 C．0.15 D．0.55