(a) Enamel is the hardest substance in the body. It is rich in calcium. (b) In man, tooth is composed of hard, bone-like substance called dentine. It enclose the pulp cavity.
A subject’s easiest problems for humans are assigned a difficulty level of ‘1,’ and a subject’s hardest problems are assigned a difficulty level of ‘5.’ Concretely, the first few problems of an AMC 8 exam are often level 1, while AIME problems are level 5." Answer Description: ...
【题目】The place ___ the bridge is supposed to be built should be ___ the cross-river traffic is the heaviest. A. which; whereB. where; in which C. in which; whereD. in which; in which试题答案 在线课程 【答案】C 【解析】 试题分析:考查定语从句和表语从句。本句中含有一个定语从...
The death of a child, _51_ one’s own child, is something the mind can hardly comprehend、 It seems to go _52_ nature、 The end of a life that is still forming _53_ has just begun is an almost unthinkable cruelty、But it happens、 Parents sometimes must witness the illness and deat...
In the slightly more than half a century that the organometallic chemistry of ruthenium has had time to develop, it has become clear that the metal's position as the 'middle child' of the Group 8 metals is richly reflected in its organometallic derivatives. That is, despite many similarities...
Topaz is the hardest silicate mineral, along withBeryl. It is usually found in high-temperature tin-bearing veins, in granites, in gas pockets in rhyolite, and in pegmatites. Topaz is tough enough to endure the pounding of streams, where topaz pebbles can occasionally be found. ...
Linkin Park were one of the most commercially successful rock bands of the 2000s thanks to the popularity of a few of their massive albums. But which of their albums is the best? That's what we want to know during this week's Loudwire Nights Album of the Week poll. You'll have ...
Linkin Park were one of the most commercially successful rock bands of the 2000s thanks to the popularity of a few of their massive albums. But which of their albums is the best? That's what we want to know during this week's Loudwire Nights Album of the Week poll. You'll have ...
From gifting her a German Shepherd puppy to insisting she never be alone, Ian’s commitment to Allison’s safety is unwavering. Yet his protective instincts also reveal the undeniable chemistry simmering between them. The close quarters of their newfound partnership—including the occasional “...
(Note: The hardest engineering majors for you will depend on a lot of personal factors, so this is only an estimate.Also, we are comparing the difficulty of different engineering majors to each other, not how difficult they are compared to a completely different field such as majoring in, ...