使用滑轮的直径，通常不得小于钢丝绳直径的（）倍。A、16B、12C、8D、4

如果兴海公司未能交货是由于当地山洪暴发，导致道路不通，能否以此为由向外贸公司主张免责为什么

下列可引起呕吐伴右上腹痛、发热、黄疸的疾病是（）。

A.急性肠炎

B.急性胰腺炎

C.急性腹膜炎

D.急性肾盂肾炎

E.急性化脓性胆管炎

石油、化工生产企业进行检修作业前，要作好各种准备工作，准备工作主要包括 ( )。

A．确定检修指挥、安排好生产进度、制定检修管理制度、储备好生产原材料

B．储备好物资材料、安排好生产进度、修订检修管理制度、对全体员工进行安全教育

C．设置检修指挥部、制定检修方案、检修前的安全教育、检修前的检查

D．确定新设备的位置、进行新设备定货或制作、安排好生产进度、检修前进行检查

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)

测定装置输出功率稳定度时，时间应不少于60s。