單項(xiàng)選擇題風(fēng)是指冷暖氣團(tuán)的交界面,當(dāng)冷鋒過(guò)境時(shí)()。

A.氣壓升高,風(fēng)力增大
B.氣壓降低,風(fēng)力增大
C.氣壓升高,風(fēng)速不變
D.氣壓降低,風(fēng)速不變


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1.單項(xiàng)選擇題渤海平均高潮間隙變化一般較小,但()附近產(chǎn)生較快。

A.黃口
B.煙臺(tái)
C.大連
D.秦皇島

2.單項(xiàng)選擇題渤、黃海沿岸各站平均水位在()出現(xiàn)正值,()后出現(xiàn)負(fù)值。

A.4月;7月
B.4月;10月
C.7月;10月
D.1月;2月

最新試題

翻譯:The application of physics to the study of rocks (geophysics)is very important in petroleum geology. In its broadest application geophysics makes a major contribution to understanding the earths crust and, especially through the application of modern plate tectonic(板塊構(gòu)造)theory, the genesis and petroleum potential of sedimentary basins. More specially, physical concepts are required to understand folds(褶皺), faults(斷層), and diapers(底辟), and hence their roles in petroleum entrapment.

題型:?jiǎn)柎痤}

翻譯:Nearly three-fifths of all known petroleum reserves on Earth is to be found in the territory of the various Arabic-speaking countries. Kuwait , for instance , which is a small nation at the head of the Persian Gulf , with an area only three-fourths that of Massachusetts and a population of about half a million , posseses about one-fifth of all the known petroleum reserves in the world.

題型:?jiǎn)柎痤}

翻譯:The HF-HCI mixture (usually 3-percent HF and 12-percent HCI) then is injected. The HF reacts with calys, sand, drilling mud, or cement filtrate to improve permeability near the well-bore.The HCI will not react and is present to keep the PH low, preventing precipitation of HF reaction products. Sent to keep the PH low, preventing precipitation of HF reaction products.

題型:?jiǎn)柎痤}

翻譯:The transportation of oil has also led to the spectacular development of gait ships ,the largest ships that ever sailed the oceans of the world .in the last few years ,since it has been necessary to ship oil from middle East-one of the largest oil producing regions-around the cap of Good Hope in south Africa these tanks has grown to almost unblievable proportions.

題型:?jiǎn)柎痤}

翻譯:The need for a greater understanding of the pumping process and for the ability to engineer pump installations to a close degree of tolerance is being accentuated by the trend to pump from greater and greater depths . Problems are relatively minor when the pump is at 10,000 ft.

題型:?jiǎn)柎痤}