下面是钠元素和氯元素在元素周期表中的信息和3种粒子的结构示意图。请回答下列问题：

发布时间：2017-05-01 13:53 │ 来源：www.tikuol.com

题型：填空题

问题：

下面是钠元素和氯元素在元素周期表中的信息和3种粒子的结构示意图。请回答下列问题：

（1）氯原子的核电荷数是_____________；原子序数为11的原子的相对原子质量是_____________，钠原子与氯原子的最本质区别是_____________。

（2）在钠和氯气生成氯化钠的反应中，得到电子的是_____________原子；Na⁺的结构示意图是_____________，（填字母）。

考点：单质和化合物纯净物和混合物氧化物同素异形体

题型：填空题

Directions: There are 10 blanks in the following passage. For each numbered blank, there are 4 choices marked A, B, C and D. Choose the best one and mark your answer on the ANSWER SHEET with a single line through the center.

Older female managers are (51) that working under the (52) of younger female managers can be particularly (53) . While older women generally have long accepted the (54) of working for younger men, some are having difficulty in coming to grips with the idea that younger women are occupying more and more (55) positions. Today, nearly 1.5 million women under the age of thirty-five hold managerial jobs, up from 322,000 in the early 1970s. On one hand, this (56) signals improvement in the status of career-minded women. On the other hand, it can stifle progression and lead to dissatisfaction. Older women tend to be deferential (恭敬的，恭顺的) with coworkers and maternal with supervisors. Such (57) can infuriate young female executives and can (58) stressful working conditions. Conflict often arises because older workers frequently feel that they wow how things ought to be (59) . Their advice is sought in some cases, but most of the time they are perceived as a (60) of the "problem" by younger, career-oriented female managers.

A．superstar

B．superpower

C．supervision

D．superman

查看答案

题型：填空题

下列对会计基本假设的表述中恰当的是()

A、在会计分期的前提下，会计确认、计量和报告应该以企业持续、正常的生产经营活动为前提

B、一个会计主体必然是一个法律主体

C、持续经营确定了会计核算的空间范围

D、会计分期确立了会计核算的时间范围

查看答案

题型：填空题

若x表示一个两位数，y也表示一个两位数，小明想用x，y来组成一个四位数，且把x放在y的右边，你认为下列表达式中正确的是[ ]

A．yx

B．x+y

C．100x+y

D．100y+x

查看答案

题型：填空题

如图7-7-4所示，小物块A、B、C质量相等，均为m.A、B用细绳绕过轻小滑轮相连接.不计细绳、滑轮质量及一切摩擦，两滑轮间距离为="0.6" m.开始时A、B静止，现将小物块C挂在两滑轮间细线的中点O处，求：

图7-7-4

（1）物块C下落多大高度时的速度最大？

（2）物块C下落的最大距离多大？

查看答案

题型：填空题

Not until this morning（）your delayed letter of credit.

A.we received

B.did we receive

C.we have received

D.had we received

查看答案

更多题库