掩码用于识别IP地址网络部分/主机部分。每一个网络都选用（）位的掩码，掩码中的1对应

下列各项中，能够反映投资与收入对等原则的是（）。

A.企业的收入分配应依法进行

B.企业收入分配必须兼顾各方利益

C.谁投资谁受益、收入大小与投资比例相对等

D.企业收入分配应坚持积累与分配并重

证券交易所竞价交易中股票、基金、权证交易单笔申报最大数量为（）。

A.不超过100万股（份）

B.不超过1万手

C.不超过1万手

D.不超过5万手

下列叙述不正确的是（  ）

A．向AlCl₃溶液中滴加氨水，产生白色沉淀；再加入NaHSO₄溶液，沉淀溶解

B．在Cu(NO₃)₂溶液中加入铜粉，铜粉不溶解；再加入稀硫酸溶液，铜粉溶解

C．用如图所示的装置可以测定黄铜(Cu，Zn合金)中Zn的含量

D．在FeCl₃溶液中加入KSCN溶液，溶液变红，加入足量铁粉充分振荡，溶液红色褪去

关于有效咳嗽叙述错误的是

A．适用于神志清醒尚能咳嗽的病人
B．先深呼吸并用力咳嗽，痰到咽部时轻轻咳出
C．咳嗽时身体前倾
D．咳嗽时头颈屈曲
E．可取坐位

In January 2008 Arti entered in a contractual agreement with Bee Ltd to write a study manual for an international accountancy body’s award. The manual was to cover the period from September 2008 till June 2009, and it was a term of the contract that the text be supplied by 31 June 2008 so that it could be printed in time for September. By 30 May, Arti had not yet started on the text and indeed he had written to Bee Ltd stating that he was too busy to write the text.Bee Ltd was extremely perturbed by the news, especially as it had acquired the contract to supply all of the accountancy body’s study manuals and had already entered into extensive preliminary expenses in relation to the publication of the new manual.Required:In the context of the law of contract, advise Bee Ltd whether they can take any action against Arti. (10 marks)