What's right about the general properties of crystal? A: If there are anions in a crystal, there must be cations B: If there are anions in a crystal, there must be cations C: There are not necessarily chemical bonds in molecular crystals D: There must be no covalent bond in the ionic crystal

​An ionic crystal consists of cations and anions, therefore, the ionic crystal can conduct electricity.‍

天气预报用（）报表示。 A: META B: SPECI C: TAF D: 以上都不对

Integration （） is the process of verifying that the components of a system work togedler as described in the program design and system design speci6cations. A: trying B: checklng C: testing D: coding

Which of the following cations can be separated by NaOH solution? A: Cr3+ and Al3+ B: Cu2+ and Zn2+ C: Cr3+ and Fe3+ D: Cu2+ and Fe3+

For the differences of magnetic moments of the following cations in strong and weak octahedral crystal field, which difference is the smallest? A: Mn2+ B: Fe2+ C: Co2+ D: Cu2+

International commuters means those employees who typically live in their home countries but regularly commute to specific foreign countries to perform some aspect of their work.

补充完整SQL语句,完成要求:查询所有配电物资的物资编号、物资名称、规格。SELECT mat_num, mat_name, speci ____ stock;

在METAR/SPECI中，假如平均风向为26度，平均风向应编报为（） A: 20 B: 020 C: 030 D: 30

配电物资库存记录表： stock（mat_num, mat_name, speci, warehouse, amount, unit, total）其中mat_num为主码。 请将属性和含义匹配起来：