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【单选题】
环境污染物甲基汞和汞的毒性作用的靶器官主要是( )A.
脑
B.
甲状腺
C.
呼吸系统
D.
生殖系统
E.
消化系统
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【简答题】Mrs. Green has _31 _children ,one is Tom,_ 32 _is Ann.Tom is seven years old, and Ann is two years younger. Tom goes to school,but Ann_ 33_ .When Tom is at home, he often _34 _with Ann.Usually he's ve...
【简答题】【吐槽】魏健宁(99728217) 2020/2/24 8:17:07 材料科学基础(原子结构)作业: 【吐槽】魏健宁(99728217) 2020/2/24 8:17:43 1. 原子中一个电子的空间位置和能量可用哪四个量子数来决定? 2. 在多电子的原子中,核外电子的排布应遵循哪些原则? 3. 铬的原子序数为24,它共有四种同位素:4.31%的Cr原子含有26个中子,83.76%含有28个中...
【单选题】元素的原子结构决定其性质和在周期表中的位置。下列叙述正确的是
A.
多电子原子中，在离核较近的区域内运动的电子能量较高
B.
原子核外电子的数目越多，电子的运动状态就越多
C.
轨道表示式，是对原子核外电子运动状态最完美的描述
D.
所有元素原子的最外层电子数都等于该元素的最高化合价
【简答题】阅读理解。 Lost Dog, Jan 2nd He's an 18-month old white good-looking dog. We've only had him for two weeks, so he may not know his way back. We've contacted with his last owners who live in Ballybrack, but...
【简答题】During the day, Mercer, is a hard-working dog , helping his owner and sure she stays safe. But at night, the big, black dog slips out of the house, tries his paws at ice-skating, and even makes...
【简答题】完形填空。 Jimmy is a black and white dog. We all like 1 very much. He is a member of our 2 . Jimmy is one and a half years old. He usually 3 at about 7: 00 a.m. And at 7: 30 he eats his 4 . He usually has...
【简答题】Brian is my good friend. He has a five-year-old daughter, Lydia. Lydia likes animals very much and always 1 to have a dog. This Sunday is Lydia's birthday. Brian wants to buy 2 a dog. So he goes to th...
【单选题】In his junior year, Gates ______ Harvard to devote his energies to Microsoft.
A.
stopped off
B.
gave in
C.
dropped out of
D.
pulled up
【单选题】Why did Gates drop out of Harvard in his junior year?
A.
Because he could not pay the tuition.
B.
Because he fell far behind others in his study.
C.
Because he didn't like the subject he was majoring.
D.
In order to devote his time to Microsoft.
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