2.下列粒子的电子式书写正确的是HA.NNB.[H:N:H]+[:C1:]HC.H+F:]D. Na_2^+,S*S*3^(2-) 相关知识点: 试题来源: 解析 2.B[书写电子式应首先判断是离子化合物还是共价化合物,在共价化合物中,共用电子对为两成键原子所共用,不属于任何一方,所以不能用方括号括起来。尽管有共用电子对的偏移...
(2)直线EF:y=kx-k交AB于E点,与x轴交于D点,交BC的延长线于点F,且S△BED=S△FBD,求k的值; (3)如图2,M(2,4),点P为x轴上一动点,AH⊥PM,垂足为H点.取HG=HA,连CG,当P点运动时,∠CGM大小是否变化,并给予证明. 试题答案 在线课程
15.1/2自旋算符可用泡利矩阵σ=(a1,O2,3)表示为S=ha/2,其中a3的两个本征态为a与β(1)求σ·n的本征态,其中n=( sin 6 cos @, sin
1.The man's stomach was caused by too much worry.( ) 2.The doctor's earlier patient had made some clothes for the new one.( ) 3.The earlier patient wasn't worried any more because he had paid for the tailor.( ) 4.The tailor was worried about that the man whom he made clothes...
短文改错 I have a good friend who’s name is Liu Mei. She is our (1) monitor and one of the excellent students in our class. (2) Clever as she is,but she works very hard. We have a (3) lot on common and hav
百度试题 结果1 题目阅读短文,判断正(T C1. The new(2. There's C)3. There's C4. There()5. We ha 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
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