某电解池中，若在2s内有1.0×10¹⁹个二价正离子和2.0×10¹⁹个一价负离子通过某截面，那么通过这个截面的电流是（   ）

如图所示，请将下列几何体分类．

    Chinese people are proud of their food. However, when foreigners like Britons think of Chinese food, their impressions (印象) of ____ are different from what you might think.

    I grew up in the UK. The Chinese food I was used to ____was food from Guangdong. For example, a(n)____ dish I would order would be sweet and sour pork (糖醋排骨). This is the type of food we generally eat ____ lots of Chinese immigrants (移民) to the UK have come from Guangdong.

    Something is changing, though Chinese-American cook Ken Hom has been____British TV for 30 years, and he said, “At the beginning of the 1980s, Chinese food was sweet and sour pork, mainly … Now you are seeing more Chinese food from Sichuan, Hunan and other ____of China. It is no longer just Cantonese food.”

    What do foreigners think when they come to China and taste real Chinese food? You'll be glad____ that in my experience, the impressions have been very good.

    My personal favorite is Yunnan food. And every foreigner I've eaten it with was____ by the different flavors (风味) when they try it.

    One of my friends____in Yunnan for a year. She says she still hasn't had “proper Yunnan food” since then. That's the____when you finally eat real Chinese food—you become picky (挑剔的)!

大气压强跟天气和高度有密切的关系．如果人因天气感到闷热时，气压____ (填高或低)，这时的天气可能是____ ；在高山上要煮熟饭，要用密闭的高压锅，如图，这是因为____ 。