单项选择题

粉状乳化炸药生产过程中的火灾爆炸危险因素主要来自( )。

A.物质的危险性
B.生产设备的高速运转
C.环境条件
D.水相材料和油相材料间的强剪切力

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单项选择题

对于柴油、煤油、汽油、蜡油来说，其自燃点由高到低的排序是( )

A.汽油—煤油—蜡油—柴油
B.汽油—煤油—柴油—蜡油
C.煤油一汽油一柴油一蜡油
D.煤油一柴油一汽油一蜡油

未分类题

听力原文： Dyslexia is a term used to describe a marked difficulty in learning to read despite normal intelligence and vision. The problem is universal, but research suggests it doesn't affect every culture or language group equally. On China's mainland and in Japan, for example, dyslexia rates are estimated at less than 5 percent compared to 10 percent to 20 percent in the U.S. There are intriguing theories as to why, and Japan has produced some important clues.Japanese children first learn to read and write in parallel phonetic alphabets, hiragana and katakana, each containing 46 characters relating to 46 different sounds. After conquering them, the student embarks on learning Chinese characters. According to Uno, who works for Japan's National Center of Neurology and Psychiatry, just I percent of Japanese students have dyslexic problems in reading the phonetic alphabets, while 2 percent encounter problems with Chinese characters. The numbers jump a bit when it comes to writing—2 percent for hiragana, 3.8 percent for katakana and 5 percent for ideograms—but they're still low by American standards.The passage is about______.A.dyslexia and intelligencE.B.dyslexia and culturE.C.dyslexia and vision.D.dyslexia and personality.

A.S.
B.
C.8
D.
The
E.
A.dyslexia
F.
B.dyslexia
G.
C.dyslexia
H.
D.dyslexia

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