下列物质中,化学式能准确表示该物质分子组成的是( ) A.氯化铵(NH4Cl)

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问题:

下列物质中,化学式能准确表示该物质分子组成的是(  )

A.氯化铵(NH4Cl)

B.二氧化硅(SiO2

C.白磷(P4

D.硫酸钠(Na2SO4

考点:电子式的书写
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鸟类是脊椎动物中唯一会飞的动物。(   )

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关于腹部CT扫描技术的描述,不正确的是()

A.腹部CT扫描可以观察有无腹部肿瘤及腹腔的淋巴结转移

B.检查当日空腹

C.腹部肝脏、脾脏、胰腺、肾脏通常采用三期扫描

D.腹部CT血管造影通常用于腹主动脉及其大分支的血管成像

E.肾上腺一般用软组织窗观看:窗宽200~300HU,窗位30~50HU

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Esther was employed by Kufuma (Pvt) Ltd as a secretary. Upon commencement of her employment she signed a document headed ‘contract of employment’ whose contents included the following:(a) The employee was to be bound by the Labour Act [Chapter 28:01] and Regulations made under it.(b) The employer can summarily terminate the contract in the event of gross misconduct as defined in the company’s code of conduct.(c) The employee will not be paid for time spent on trade union or workers’ committee activities.(d) The employer reserves the right to vary the employee’s job description and terms and conditions of work.In the course of time Esther became pregnant and sought to go on maternity leave. She was granted such leave in terms of the Labour Act. Upon her return, she was given work in a different department, which was slightly below that of a secretary. The employer relied on clause (d) above, as authority for its decision. Esther protested and she now wants to leave Kufuma (Pvt) Ltd’s employment immediately.Required:In relation to employment law, advise Esther on whether or not she can lawfully leave the employer immediately and without notice. (10 marks)

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重症肌无力患者伴有胸腺瘤约()

A.5%

B.15%

C.65%

D.75%

E.85%

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半衰期最长的钙拮抗药是()

A.维拉帕米

B.氨氯地平

C.尼莫地平

D.地尔硫

E.硝苯地平

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